Copyright
Horace Scudder Uhler.

Atlas of absorption spectra online

. (page 6 of 9)
Online LibraryHorace Scudder UhlerAtlas of absorption spectra → online text (page 6 of 9)
Font size
QR-code for this ebook


as a transition form between Nos.
104 and 106. Solutions Nos. 104
and 105 have the same empirical
formulae.

106. Acid Rosamine A. (A.) Sodium salt

of di - mesidyl - m - amido - phenol -
phthale'in-sulphonic acid.

Fig. 19, pi. 5 ; No. 508, S. & J.

Light-red powder. In solution red,
pink.

10 g. per liter.

Angle 29.3'. Depth o to 0.27 mm.

Single V-shaped band in the green.
Weak absorption beginning with ex-
tinction at 0.20/4 and fading gradu-
ally to transparency at 0.32/4. Ab-
sorption band covers the interval
from 0.505/1 to 0.565/1 with its max-
imum at 0.535/1. Transparent from
0.565/4 to 0.63/4.

107. Uranine. (B.) Sodium or potassium

salt of fluoresceine.

Figs. 15 and 16, pi. 4; No. 510, S. & J.

Yellowish-brown powder. In solution
reddish yellow, yellow.

Intense, narrow band in the blue-green
with a weaker companion on its more
refrangible side. Very strong, yel-
lowish-green fluorescence.



COLORING MATTERS.



39



107. Uranine Continued.

Fig. 16 resulted from a solution of 2 g.
per liter.

Angle 23.4'. Depth o to 0.21 mm. Only
the stronger band shows. Here it
extends from 0.480/4 to 0.504/4 with
its maximum at 0.493/4.

Fig. 15 corresponds to 2.67 g. per liter.
The angle 31.2' gives a maximum
depth of 0.49 mm. Complete trans-
parency from 0.330/4 to 0.443/4. The
spectrogram shows that the visible
region of absorption has roughly
parallel sides which are very definite.
The visible maximum is at 0.493/4
as before. At the outer edge of the
fifth strip the absorption covers the
interval from 0.443/4 to 0.515/4.

A solution of 5 g. per liter, of angle
42.5', and of depth o to 0.36 mm.,
absorbed from 0.432/4 to 0.518/4 with
the maximum at 0.493/4.

A solution of 20 g. per liter with an
angle of 42.5' caused the ultra-violet
and visible absorption bands to
coalesce, on the third photographic
strip, in a semi-transparent region
extending roughly from 0.355/4 to
0.395/4. Intense absorption from
Q-SQS/* to O-S33A 1 - The short wave-
length boundary is indefinite, but the
opposite limit is very sharply de-
fined and steep. Maximum absorp-
tion at 0.493/4.

Tests were made to ascertain whether
or not the conditions were favor-
able to contamination of the absorp-
tion spectra by the fluorescent light.
The most dilute solution was illu-
minated with intense ultra-violet
light and an exposure of five min-
utes was given to the photographic
film. Full development of the film
brought out no trace of previously
incident light. Therefore, since the
Nernst glower alone was used in
making the records of the visible
bands and because, in all cases ex-
cept one, more concentrated solutions
were used, it follows that the spec-
trograms are correct representations
of the absorption, at least so far
as the fluorescent light is concerned.
108. Eosine, yellowish. (A.) Alkali salts

of tetrabromo-fluoresceme.
Fig. 58, pi. 15; No. 512, S. & J.



108. Eosine, yellowish Continued.

Deep red powder. In solution yellow-
ish red, pink.

20 g. per liter.

Angle 21.3'. Depth o to 0.18 mm.

Very strong absorption in blue and
green. Faint green fluorescence in-
creasing with dilution. Intense ab-
sorption from 0.20/4 to 0.33/4. The
absorption then decreases, first gradu-
ally and then steeply, to partial trans-
parency at 0.37/4. This transparent
region continues as far as 0.434/4.
Intense absorption from 0.434/4 to
0.56/4. From 0.515/4 to 0.525/4 the
solution is almost opaque. Two un-
resolved bands seem to be present.
The more refrangible boundary of
the visible absorption is less definite
than the opposite side. The latter
limit is steep and sharp. Transpar-
ent from 0.56/4 to 0.63/4.

109. Eosine a 1'alcool. (B.) Potassium

salt of tetrabromo-fluoresceme-ethyl-
ether.

Fig. 17, pi. 5 ; No. 514, S. & J.

Brown powder mixed with small,
green crystals. In solution red, pink.

4.29 g. per liter (heated).

Angle 46.8'. Depth o to 0.43 mm.

Sharp, narrow band in green, abrupt
on yellow side and diffuse on the
blue side due to a faint companion
band. Slight greenish-yellow fluo-
rescence. Very weak absorption in
extreme ultra-violet. Absorption be-
gins at 0.495/4 and ends at 0.540/4.
The chief maximum is at 0.525/4.
Transparent from 0.540/4 to 0.63/4.

1 o. Methyl Eosine. (A.) Potassium salt

of dibromodinitro-fluoresceme.

Similar to fig. 58, pi. 15; No. 515,
S. & J.

Brown, crystalline powder. In solution
red, orange.

10 g. per liter.

Angle 15.6'. Depth o to 0.14 mm.

Intense band in blue and green. Ap-
parently two unresolved bands. Sim-
ilar absorption to that of solution
No. 108. Absorption is rather com-
plete from 0.20/4 to 0.30/4 and then
decreases to about 0.36/4. Strong
absorption from 0.46/4 to 0.56/4. The
principal maximum is at 0.52/4. Very
transparent from 0.56/4 to 0.63/4.



ATLAS OF ABSORPTION SPECTRA.



in. Eosine, bluish. (B.) Sodium salt of
tetraiodo-fluoresceine.

Similar to fig. 58, pi. 15; No. 517,
S. & J.

Lavender powder. In solution red,
pink.

15 g. per liter.

Angle 21.3'. Depth o to 0.18 mm.

Intense absorption in the blue-green.
Similar absorption to that of solu-
tion No. 108. The yellowish-green
fluorescence only appears in dilute
solutions. Absorption decreases
gradually from 0.20/1 to 0.36/1. In-
tense absorption from 0.455/1 to
0.555/4. Maximum of absorption at
0.52/1. There seem to be two unre-
solved bands of which the more re-
frangible is a little less intense than
its companion. This region of ab-
sorption is sharper and steeper at
its yellow border. Transparent from
0.555/1 to 0.63/1.

112. Erythrosine. (M.) Sodium salt of

tetraiodo-fluoresceine.

Fig. 59, pi. 15; No. 517, S. & J.

Dark-red powder. In solution red,
pink.

15 g. per liter.

Angle 21.3'. Depth o to 0.18 mm.

Intense absorption in the blue and
green. A strong band in the middle
with a slightly weaker, unresolved
companion on each side. The yel-
lowish-green fluorescence only ap-
pears in dilute solutions. The re-
gion of visible absorption is from
0.455/1 to 0.562/1. The chief maxi-
mum is about 0.518/1. The yellow
edge of this group of bands is very
sharply defined. Transparent from
0.562/1 to 0.63/1.

113. Cyanosine. (M.) Alkaline salt of

tetra - bromodichloro - fluoresceine-
methyl-ether.

Fig. 18, pi. 5; No. 519, S. & J.

Brownish-red powder. In solution red,
bluish pink.

Saturated (boiled).

Angle 25.4'. Depth o to 0.23 mm.

Band in blue-green and green. Faint,
yellowish fluorescence. Strong ab-
sorption from 0.493/1 to 0.553/1 with
its maximum at 0.525/1. Transpar-
ent from 0.553/1 to 0.63/1.



114. Rose Bengal. (B.) Alkaline salt of

tetraiododichloro-fluoresceme.

Similar to fig. 59, pi. 15; No. 520,
S. & J.

Brown powder. In solution red, orange.

15 g. per liter.

Angle 21.3'. Depth o to 0.18 mm.

Double, unresolved pair of bands in
green. In amyl alcohol the bands
were nearly resolved. Strong ab-
sorption from 0.20/1 to about 0.33/1,
except a slight weakening at 0.295/1.
Transparent from 0.33/1 to 0.48/1.
Strong absorption from 0.48/1 to
0.575/1. Transparent from 0.575/1 to
0.63/1.

115. Phloxine. (B.) Sodium salt of tetra-

bromotetra-chloro-fluorescelne.

Fig. 60, pi. 15 ; No. 521, S. & J.

Brick-red powder. In solution cherry
red, pink.

12.5 g. per liter.

Angle 42.5'. Depth o to 0.36 mm.

Intense absorption in the green. Dark-
green fluorescence. Visible band lies
between 0.458/1 and 0.57/1. The max-
imum is near 0.525/1. For dilute so-
lutions the absorption is very much
like that shown by fig. 18, except
that the contour of the band in the
green is sharper than for solution
No. 113.

116. Galleme. (By.) Pyrogallol-phthalein.
Similar to fig. n, pi. 3 ; No. 525, S. & J.
Violet brown powder. In solution very

dark brown, brown.

Saturated (heated).

Angle 58.5'. Depth o to 0.54 mm.

Hazy-edged absorption in the blue-
green and green. Absorption is com-
paratively strong at 0.20/1 and de-
creases very gradually to semi-trans-
parency about 0.435/1. Only partial
transparency exists between 0.435/1
and 0.485/1. A V-shaped band ab-
sorbs from 0.485/1 to 0.553/1. The
maximum is about 0.52/1. The end
of the negative slants a good deal,
showing general absorption in the
yellow-orange. The spectrogram is
like that which would be obtained
with a more concentrated solution of
No. 47 if it were possible to produce
such a condition.



COLORING MATTERS.



1 17. Phosphine. (M.) Nitrate of chrysani-

line ( unsym. diamido - phenyl - acri-
dine) and homologues.

Fig. 32, pi. 8; No. 532, S. &J.

Orange-yellow powder. In solution
brown, yellow.

11.25 S- P er liter (heated and filtered).

Angle 27.3'. Depth o to 0.25 mm.

Absorption in violet, blue, and green
with hazy limits. Strong absorption
from 0.20/1 to 0.295/1, then weaken-
ing to semi-transparency at 0.32511.
Next a band with maximum at
0.36/1. Return to partial transpar-
ency at 0.41/1. Then follow two un-
resolved bands with maxima about
0.458/1 and 0.50/1. Complete trans-
parency from 0.52/1 to 0.621*. A solu-
tion so concentrated as to absorb all
the ultra-violet and visible spectrum
from 0.20/1 to 0.538/1 was transpar-
ent to 0.63/11.

118. Alizarine Brown. (M.) Trioxyanthra-

quinone.

Similar to fig. ir, pi. 3 ; No. 538, S. & J.

Dark-brown powder. In solution dull
brown, brown.

Saturated.

Angle 35.1'. Depth o to 0.32 mm.

General, indefinite absorption except
in the red. Absorption intense and
uniform from 0.20/11 to 0.33/1. From
0.33/11 the absorption decreases very
gradually and nearly linearly to
about 0.47/1. A very weak band with
its maximum at 0.52/1 exists over
and above the intensity minimum of
the sensitized film. The end of the
negative slopes appreciably, denoting
continued general absorption in the
orange. No visible weakening of the
red. A maximum of transparency is
around 0.48/1. The spectrograms for
solutions Nos. 116 and 118 are very
similar.

119. Alizarine Red S. (B.) Sodium salt of

alizarine-monosulphonic acid.

Fig. 14, pi. 4; No. 546, S. & J.

Orange-yellow powder. In solution
reddish yellow, yellow.

12 g. per liter (heated and filtered).

Angle 30.0'. Depth o to 0.45 mm.

Absorption in violet and blue. Opaque
from 0.20/1 to 0.275/1. Absorption
decreases gradually from 0.275/1 to
partial transparency at 0.377/1, and



1 19. Alizarine Red S Continued.

then increases to a maximum at
0.42/1. Absorption ends at 0.485/1.
No visible absorption from 0.49/1 to
0.63/1.

120. Alizarine Blue S. (B.) Sodium bisul-

phite compound of dioxy - anthra-
quinone-/3-quinoline.

Fig. 28, pi. 7; No. 563, S. & J.

Chocolate-brown powder. In solution
yellowish brown, brown.

7-37 g- per liter.

Angle 58.5'. Depth o to 0.54 mm.

Absorption in violet, blue, and green.
The absorption extends into the
ultra-violet. Absorption from 0.20/1
to 0.33/1 is almost complete save a
slight weakening around 0.285/1. In-
tense maximum at 0.315/1. Absorp-
tion decreases abruptly from be-
yond 0.33/1 to transparency at 0.36/1.
The transparent region is from
0.36/1 to about 0.385/1. A pair of
wide bands absorbs from 0.385/1 to
0.543/1. Their maxima are at 0.44/1
and 0.517/1. The intervening mini-
mum of absorption is at 0.48/1.
Transparent from 0.543/1 to 0.63/1.
The ultra-violet bands remain very
intense even when dilution causes
the visible bands to disappear.

121. Neutral Red. (D. H.) Hydrochloride

of dimethyldiamido-toluphenazine.

Similar to fig 54, pi. 14; No. 580,
S. & J.

Dark-green powder. In solution red,
pink.

3 g. per liter.

Angle 39.0'. Depth o to 0.36 mm.

Band in blue and blue-green, not sharp
at edges. Very similar absorption
to that of solution No. 122. Slight
transparency at 0.23/1. A band lies
between this point and 0.31/1 where
transparency begins to be complete.
An absorption band extends from
0.468/1 to 0.545/1 with its maximum at
0.507/1. Transparent from 0.545/1 to
0.63/1.

122. Phenosafranine. Diamidophenyl-phena-

zonium chloride.
Fig. 54, pi. 14; No. 583, S. & J.
Green, glistening crystals. In solution

clear red, pink.
2.5 g. per liter.
Angle 39.0'. Depth o to 0.36 mm.



ATLAS OF ABSORPTION SPECTRA.



122. Phenosafranine Continued.

Band in blue and blue-green, not sharp
at edges. The ultra-violet band ends
about 0.31/1. The visible band ab-
sorbs from 0.45/1 to 0.545/1 with
maximum at 0.50/1. Transparent
from 0.545/4 to 0.63/1.

123. Safranine. (B.) Mixture of diamido-

phenyl- and tolyl-tolazonium chlo-
rides.

Similar to fig. 54, pi. 14; No. 584,
S. & J.

Reddish-brown powder. In solution
red, red.

5 g. per liter.

Angle 27.3'. Depth o to 0.25 mm.

Definite absorption in blue-green and
green. Similar absorption to that
of solution No. 122. Strong ab-
sorption from 0.20/1 to 0.28/1. Rapid
decrease in absorption from 0.28/1
to 0.32/1. Absorption begins again
at 0.44/1, increases to a maximum
near 0.495/1, and then decreases to
transparency at 0.555/1. Transparent
from 0.555/1 to 0.63/1.

124. Heliotrope 2 B. (A.) Dimethyldiam-

ido-xylyl - xylophen-azonium chlo-
ride.

Fig.68.pl. 17; No. 590, S. & J.

Grayish-green powder. In solution
reddish violet, reddish violet.

7 g. per liter.

Angle 27.3'. Depth o to 0.25 mm.

Strong band in yellow and orange.
Transparent to deep red. Strong
absorption from 0.48/1 to 0.605/1 with
maximum near 0.535/1. Increasing
transparency from 0.605/1 into the
red.

125. Rosolane O. (M.) Phenyldiamido-

phenyl-toluphen-azonium chloride.

Similar to fig. 19, pi. 5; No. 591,
S. &J.

Olive-green powder. In solution deep
violet, faint, reddish violet.

9 g. per liter (warmed and filtered).

Angle 35.1'. Depth o to 0.32 mm.

Weak band in the green broadening
out into general absorption on the
red side. Somewhat similar absorp-
tion to that of solution No. 106.
The visible band is definitely V-
shaped and slopes more at its less
refrangible side than at its blue
boundary. Slight transparency at
0.23/1 is followed by a maximum of



125. Rosolane O Continued.

absorption near 0.27/1. Absorption
ceases about 0.33/1 and begins again
at 0.495/1. The latter band has its
maximum at 0.525/1 and fades into
general absorption around 0.563/1.
The end of the positive slants ap-
preciably, thus emphasizing the gen-
eral absorption in the orange. Trans-
parent to the red.

126. Nigrosine, soluble. (A.) Sodium salts

of sulphonic acids of spirit nigro-
sines.

Somewhat like figs. 20 and 21 of pis.
5 and 6, respectively ; No. 602, S. & J.

Coal-black, glistening lumps. In solu-
tion blackish blue, dull blue.

Saturated.

Angle 31.2'. Depth o to 0.29 mm.

Very indefinite absorption in the yel-
low and orange. The ultra-violet
absorption is like that of solution
No. 127, while the visible absorp-
tion is similar to that of solution
No. 46. However, the band at
0.528/1 is incomparably weaker than
the corresponding band of solution
No. 46. Absorption rather strong
between 0.20/1 and 0.30/1. From 0.30/1
the absorption decreases to transpar-
ency at 0.35/1. Different photo-
graphic emulsions show a weak
band about 0.528/1. Absorption
continues general into the red, as is
shown by the appreciable slant of the
end of the negative.

127. Naphthalene Red. Mixture of amido-

naphthyl-naphthazonium chloride and
diamido - naphthyl - naphthazonium
chloride.

Fig. 20, pi. 5 ; No. 614, S. & J.

Dark-brown powder. In solution red,
faint pink.

Saturated (heated).

Angle 31.2'. Depth o to 0.29 mm.

Hazy-edged absorption band in the
green. The visible band extends
from 0.488/1 to 0.545/1 with its max-
imum at 0.517/1. The slight inclina-
tion at the red end of the negative
shows appreciable decrease of trans-
parency, between 0.545/1 and 0.63/1,
with increase of thickness of absorb-
ing layer.

128. Alizarine Green B. (D.) Dioxy-

naphthazoxonium sulphonate.
No. 647, S. & J. *



* Spectrogram too indefinite for reproduction.



COLORING MATTERS.



43



128. Alizarine Green B Continued.
Dark-green powder. In solution dark

green, light green.

20 g. per liter (heated and filtered).

Angle 31.2'. Depth 0.26 to 0.55 mm.

General absorption in the violet,
orange, and red. The minimum of
absorption lies in the green, of
course. When the depth was o to
0.29 mm., the ultra-violet absorption
ended at about 0.355/11. There is no
sharp band in the ultra-violet, but
simply one-sided absorption, decreas-
ing from 0.20/1 towards the longer
wave-lengths.

129. Columbia Yellow. (A.) Oxidation

products of dehydrothiotoluidine-sul-
phonic acid or of the latter and
primuline together.

Fig. 13, pi. 3 ; No. 663, S. & J.

Brownish-yellow powder. In solution
yellow, light yellow.

10 g. per liter ("warmed).

Angle 31.2'. Depth o to 0.29 mm.

Weak-edged absorption in violet. Uni-
form absorption from 0.20/4 to about
0.36/1.. Then a steady decrease in
absorption to 0.45/1. Complete trans-
parency from 0.45/1 to 0.63/4.

130. Quinoline Blue. (G.) No. 664, S. & J.
Glistening, green crystals. In solution

delicate violet, pink.

Saturated (heated).

Angle o. Depth 134 mm.

Only the blue and blue-green faintly
transmitted. (No photograph was
taken for the saturated solution.)
When 44 cc. of the saturated solu-
tion was diluted to 90 cc. a strong
band appeared in the yellow and
orange, while the red was freely
transmitted. The ultra-violet absorp-
tion extends to 0.40/1 and fades out
about 0.42/4. Weak absorption be-
gins at 0.48/1 and increases to opacity
near 0.55/4. Complete absorption con-
tinues to about 0.607/4. Absorption
decreases rapidly from 0.607/4 to
0.63/1. When 44 cc. of the saturated
solution was made up to 112 cc.
and a column 15 cm. was used, no
definite band could be seen, but
only a faint weakening of the
orange. The ultra-violet absorp-
tion was, however, complete as far
as 0.374/1 and vanished near 0.395/4.



131. Quinoline Yellow, soluble in water.

(A.) Quinoline Yellow O. (M.)
Sodium salt of the sulphonic acid
(chiefly disulphonic acid) of
quinophthalone.

Fig. 44, pi. ii ; No. 667, S. & J.

Yellow powder. In solution lemon yel-
low, faint yellow.

17.5 g. per liter.

Angle 27.3'. Depth o to 0.25 mm.

Strong band in extreme violet. One-
sided absorption in ultra-violet ends
about 0.33/4. Transparent region
from 0.33/1 to 0.345/1. A band com-
mences at 0.345/1, has its maximum
at 0.40/4, and joins a narrow, com-
panion band at 0.438/4. Maximum
of little band is about 0.448/1 and
complete transparency extends from
0.453/4 to 0.63/4. For a 5-strip nega-
tive the absorption only advanced
to 0.463/4. _

132. Indigo Carmine, dry. Sodium salt of

indigotine disulphonic acid.

No. 692, S. & J.

Deep-violet powder. In solution blue,
blue.

10 g. per liter.

Angle 23.4'. Depth o to 0.21 mm.

Transmits green and yellow. Moder-
ately intense band in the orange-red,
beginning about 0.555/4 and increas-
ing beyond 0.63/4. General absorp-
tion from 0.20/4 to complete trans-
parency at 0.37/4.

133. Acid Magenta S. (A.) Similar to

fig. 53, pi. 14.

Dark-green powder. In solution bluish
red, bluish pink.

10 g. per liter.

Angle 15.6'. Depth o to 0.14 mm.

Strong band in the green with abrupt
edges. Violet, indigo, orange, and
red are transmitted. Similar ab-
sorption to that of solution No. 95.
Partial transparency in the vicinity
of 0.265/4. A comparatively weak,
narrow band has its maximum near
0.295/4, and absorption ceases about
0.325/4. An intense region of ab-
sorption begins at 0.46/1, has its max-
imum at 0.535/4, and ends at 0.58/4.
Therefore this region slants more at
the violet border than at the orange
side. The band is very smooth and
round.



44



ATLAS OF ABSORPTION SPECTRA.



134. Alizarine Orange. (Powder 80 per

cent.) (M.)

Fig. 24, pi. 6.

Very deep-purple powder. In solution
dark red, red.

5.83 g. per liter (warmed and filtered).

Angle 27.3'. Depth o to 0.25 mm.

Weak, shadowy band in the green-yel-
low, gradually fading away in the
red. The ultra-violet absorption is
intense and one-sided, and ceases
about 0.39/1. The visible band be-
gins near 0.48/1, has its maximum at
0.525/1, and fades into general ab-
sorption about 0.56/4. The end of
the negative slopes to an unusual
extent, showing that the general ab-
sorption is relatively strong.

135. Alizarine Red No. i. 40 per cent. (M.)
Similar to fig. n, pi. 3.

Yellow paste. In solution deep yel-
low, yellow.

Saturated.

Angle 31.2'. Depth o to 0.29 mm.

Absorption very weak, general, and in-
definite. A few mm. of the solution
show complete opacity. The solu-
tion looks like a milky but yellow
emulsion. The ultra-violet absorp-
tion is relatively weak, is quite gen-
eral, and fades away to semi-trans-
parency near 0.4/1. A slight weak-
ening of transparency around 0.52/1
may be the fault of the sensitized
film. The end of the negative slopes
quite enough to indicate continued
absorption in the orange. No visible
absorption in the red.

136. Aurophosphine 4 G. (A.)
Fig. 45, pi. 12.

Reddish-brown powder. In solution
clear yellow, yellow.

11.67 P er liter.

Angle 27.3'. Depth o to 0.25 mm.

Strong absorption in the violet and
indigo. Absorption decreases from
0.20/1 to a maximum at 0.245/4 and
then follows a rounded curve to
transparency at 0.305/1. Unusual
transparency from 0.305/1 to 0.390/1.
As for />-nitrosodimethyl aniline, so
here, all the strong lines between
0.324/1 and 0.363/1 are transmitted
with almost no decrease of inten-
sity. A V-shaped band absorbs
from 0.390/1 to 0.470/1 with its max-



136. Aurophosphine 4 G Continued.

imum at 0.430/1. Transparent from
0.470/1 to 0.63/1.

137. Brilliant Croceine, blue shade. (M.)
Similar to fig. 52, pi. 13.
Bright-red powder. In solution red,

salmon pink.

7 g. per liter.

Angle 25.4'. Depth o to 0.23 mm.

Strong band in blue-green and green.
It slopes more on the blue than on
the yellow border. Similar absorp-
tion to that of solutions Nos. 21 and
43. Absorption decreases from 0.20/1
to a region of partial transparency
in the vicinity of 0.29/1. A sym-
metrical, hazy band absorbs from
about 0.305/1 to 0.385/1. A strong
band absorbs from 0.458/1 to 0.558/1
with its maximum near 0.518/1.
Transparent to the orange and red.

138. Brilliant Purpurine 10 B. (A.)
Similar to fig. 21, pi. 6.
Grayish-violet powder. In solution red,

bluish red.

5.83 g. per liter (warmed).

Angle 23.4'. Depth o to 0.21 mm.

Shadowy band in the green with gen-
eral absorption in the yellow and
orange. Similar absorption to that
of solution No. 46. Absorption de-
creases from 0.20/1 to a semi-trans-
parent region around 0.29/1. A sym-
metrical, hazy band absorbs from
about 0.30/1 to 0.38/1. Another band
begins near 0.48/1, has its maximum
at 0.52/1, and ends at 0.555/1. The
end of the negative slants at an
angle of about 30, thus emphasiz-
ing the strong, general absorption
in the yellow-orange.

139. Carthamin.

Similar to fig. 13, pi. 3.

Reddish-brown plates. In solution
brownish red, faint brown.

Concentrated.

Angle 31.2'. Depth o to 0.29 mm.

One-sided absorption in the ultra-
violet. Absorption similar to that
of solution No. 129. Absorption was
strong from 0.20/1 to about 0.34/1.
From this wave-length on, the ab-
sorption curve is round and slopes
to 0.445/1 at the edge of the spec-
trogram farthest from the compari-
son spectrum. Transparent from
0.445/1 to beyond 0.63/1. The slope



COLORING MATTERS.



45



139. Carthamin Continued.

of the blue side of the band is the
same as the corresponding region of
solution No. 119.

140. Columbia Fast Scarlet 4 B. (A.)
Similar to fig. 26, pi. 7.

Red powder. In solution yellowish
red, pink.

5.83 g. per liter.

Angle 27.3'. Depth o to 0.25 mm.

Broad absorption in the blue, blue-
green, and green. The contour is
somewhat hazy. The spectrum is
almost identical with fig. 26 for solu-
tion No. 69, therefore the wave-
lengths are not repeated here.

141. Dianil Orange G. (M.)
Fig. 34, pi. 9.

Brick-red, glistening powder. In solu-
tion yellowish red, yellow.

11.67 P er liter.

Angle 23.4'. Depth o to 0.21 mm.

Uniform absorption from the blue
border of the green to the extreme
violet and beyond. Except for slight,
wavy regions, the absorption de-
creases almost linearly from 0.20/1
to about 0.53/1. At this point it ends
rather abruptly. Transparent from
0.53/1 to 0.63/1.

142. Fluoresceine. Tetraoxypthalophenone

anhydride C2oHi 2 O 6 +H 2 O.

Cinnabar-red powder. In solution faint


1 2 3 4 6 8 9

Online LibraryHorace Scudder UhlerAtlas of absorption spectra → online text (page 6 of 9)