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band is weaker and more indefinite
than its companion. Transparent
from 0.545/1 to 0.63/1.

69. Brilliant Purpurine R. (A.) Sodium

salt of ditolyl-disazo-naphthionic-/?-
naphthylamine-disulphonic acid.

Fig. 26, pi. 7; No. 283, S. & J.

Red powder. In solution red, pink.

8.75 g. per liter.

Angle 25.4'. Depth o to 0.23 mm.

Same visible and photographic absorp-
tion as No. 67. Nos. 67 and 69 have
the same empirical formulae, but dif-
ferent chemical constitutions. Ab-
sorption gradually decreases from
0.20/1 to partial transparency at
0.388/1. This minimum of absorption
extends to 0.411/4. A pair of unre-



69. Brilliant Purpurine R Continued.

solved bands absorbs all radiations
between 0.411/1 and 0.563/1. The less
refrangible band is the more intense
and has its maximum at 0.515/1.
Transparent from 0.563/1 to 0.63/1.

70. Rosazurine B. (B.) Sodium salt of

ditolyl - disazo - bi - ethyl-/3-naphthyl-
amine-sulphonic acid.

Similar to fig. 26, pi. 7 ; No. 285, S. & J.

Brown powder. In solution red, pink.

7 g. per liter (heated).

Angle 27.3'. Depth o to 0.25 mm.

Weak absorption in the green, with
very hazy, blue boundary. Similar
absorption to that of solution No. 69.
The precise size and shape of the
visible band matches very closely the
corresponding band of solution No.
45, fig. 25. Absorption from 0.47/1
to 0.55/1, with the maximum near
0.515/1. Transparent from 0.55/1 to
0.63/1.

71. Congo Corinth. Sodium salt of ditolyl-

disazo - naphthionic-a-naphthol-/>-sul-
phonic acid.

Similar to fig. 22, pi. 6; No. 286, S. & J.

Grayish-black powder. In solution red,
pink.

9.09 g. per liter (very gritty; filtered
often).

Angle 21.5'. Depth o to 0.20 mm.

General absorption in green, yellow,
and orange. Very weak and hazy
towards the red. Similar absorption
to that of solution No. 74. Weak,
general absorption in ultra-violet,
permitting all strong lines to pass
through the solution. It fades away
about 0.35/1. Several plates and films
show that absorption begins again
about 0.49/1 and becomes relatively
small at 0.56/1. Weak, general ab-
sorption, however, continues to 0.63/1.
The maximum of absorption is inde-
terminate. Saturated solutions gave
the same general results.

72. Azo Blue. (By.) Sodium salt of ditolyl-

disazo-bi-a-naphthol-/>-sulphonic acid.
Somewhat like fig. 22, pi. 6; No. 287,

S. & J.
Bluish-black powder. In solution deep

blue, reddish blue.
4.29 g. per liter.

Angle 23.4'. Depth o to 0.21 mm.
Hazy-edged absorption in green-yellow,

yellow, and orange. The red border



COLORING MATTERS.



33



72. Azo Blue Continued.

is very indefinite and the maximum
appears to be in the yellow. Ab-
sorption is like that of solution No.
74, except in so far as it is stronger
than No. 74 in the orange. Compara-
tively weak absorption in the ultra-
violet from 0.20/4 to 0.355/1. There
are slight indications of two ultra-
violet bands with the intervening re-
gion near 0.29/4. Transparent from
0.36/1 to 0.49/1. Absorption begins at
0.49/1, increases to 0.53/1, then fades
to partial transparency near 0.59/4.
Weak absorption from 0.59/1 to 0.63/1.

73. Diamine Black BO. (C.) Sodium salt

of ethoxy-diphenyl-disazo - bi - amido-
naphthol-sulphonic acid.

Suggested by fig. 22, pi. 6; No. 304,
S. &J.

Black powder. In solution blue, blue.

7.5 g. per liter.

Angle 31.2'. Depth o to 0.29 mm.

Strong absorption in the yellow and
orange with diffuse borders. Red is
transmitted. The absorption is some-
what like that of solution No. 74
except in so far as it is stronger than
No. 74 in the orange. Absorption
decreases from 0.20/1 to about 0.37/4.
Transparent from 0.37/4 to 0.51/4.
Absorption extends from 0.51/4 into
the clear red. The maximum of ab-
sorption is indefinite.

74. Benzopurpurine 10 B. (A.) Sodium

salt of dimethoxy-di-phenyl-disazo-
bi-naphthionic acid.

Fig. 22, pi. 6; No. 307, S. &J.

Brownish-red powder. In solution red,
pink.

5.83 g. per liter.

Angle 23.4'. Depth 0.05 to 0.26 mm.

Chief absorption in the green. The
visible band extends from about
0.48/1 to 0.55/4 with its maximum at
0.515/4. The slanting end of the nega-
tive denotes general absorption in
the orange.

75. Benzoazurine. Sodium salt of dimeth-

oxy-dipheny 1 disazo-bi-a-naphthol - p-
sulphonic acid.

Somewhat like fig. 22, pi. 6; No. 311,
S. & J.

Bluish-black powder. In solution red-
dish blue, blue.

7.5 g. per liter.



75. Benzoazurine Continued.

Angle 25.5'. Depth o to 0.21 mm.

No very definite, visible band, but a
general weakening of the green, yel-
low, orange, and red. The ultra-
violet absorption is weak and ends
near 0.355/4. The region of general
absorption begins about 0.51/4 and
continues beyond 0.63/4. There is a
weak maximum near 0.53/4. The
end of the negative slants to an un-
usual degree. The contour of the
weak band is V-shaped like the
visible band for solution No. 74.

76. Diamine Green B. (C.) Sodium salt

of diphenyl - disazo-phenol-disulpho-
amidonaphthol-azo-nitrobenzene.

No. 372, S. & J. *

Dull-gray, crystalline powder. In solu-
tion bluish green, bluish green.

3 g. per liter.

Angle 17.0'. Depth o to 0.14 mm.

Gradual absorption in the orange and
red. Very weak absorption in the
ultra-violet from 0.20/4 to about
0.38/4. No visible or photographic
absorption between 0.38/4 and 0.6/1.
General absorption begins about 0.6/4.

77. Congo Brown G. (A.) Sodium salt of

sulpho - benzene-azo-resorcinol - azo-
diphenyl-azo-salicylic acid.

Figs. 35 and 36, pi. 9; No. 379, S. & J.

Brown powder. In solution light brown,
yellow.

4.67 g. per liter.

Angle 27.3'. Depth o to 0.25 mm.

Absorption in violet, blue, and green.
Very hazy at green side. Absorp-
tion decreases from 0.20/4 to a some-
what transparent region around
0.295/1. Maximum absorption at
0.365/4. Absorption ceases at 0.53/4.
A weaker solution (fig. 36) showed
transparency from 0.29/4 to 0.315/4.
Absorption from 0.315/4 to 0.428/4.
Maximum absorption at 0.365/1, as
before. Transparent to yellow,
orange, and red.

78. Congo Brown R. (A.) Sodium salt of

sulpho-naphthalene-azo-resorcin-azo-
diphenyl-azo-salicylic acid.

Fig. 35, pl. 9;No. 380, S. & J.

Dark, brownish-red powder. In solu-
tion reddish brown, yellow.

Saturated.

Angle 29.3'. Depth o to 0.27 mm.



* Spectrogram too indefinite for reproduction.



34



ATLAS OF ABSORPTION SPECTRA.



78. Congo Brown R Continued.

Same visible and photographic absorp-
tion as No. 77. The change in the
constitution is from benzene to naph-
thalene.

79. Fast Green O. (M.) Dinitroso-resor-

cinol. (Dioximidoquinone.)

Similar to fig. 11, pi. 3 ; No. 394, S. & J.

Grayish-brown powder. In solution
deep coffee brown, coffee brown.

Saturated (heated).

Angle i 6'. Depth 0.05 to 0.66 mm.

General absorption in violet and blue.
Similar absorption to that of solu-
tion No. 47. The boundaries of the
bands, however, are more definite for
solution No. 79 than for solution No.
47. From 0.20/4 to 0.325/4 the ab-
sorption is complete. Absorption de-
creases with a long, gradual slope,
from 0.325/4 to a minimum of semi-
transparency at 0.475/4. Then a
weak band with maximum at 0.52/1
presents itself and continues to 0.54/1.
Only very weak absorption is
present from 0.54/4 to 0.63/1. With
the same solution and the cell
set for 35.1' and 0.32 mm. the ab-
sorption was almost complete from
0.20/4 to 0.30/1 and then sloped gradu-
ally to transparency at 0.405/1. The
band at 0.52/4 could not be dis-
cerned.

80. Naphthol Green B. (C.) Ferrous so-

dium salt of nitroso-/?-naphthol-/?-
monosulphonic acid.

Fig 10, pi. 3 ; No. 398, S. & J.

Dark-green powder. In solution green,
light green.

8.75 g. per liter (boiled).

Angle 31.2'. Depth o to 0.29 mm.

Absorption in violet and in dark red.
Absorption very strong from 0.20/4
to 0.31/4. Then the absorption de-
creases very gradually, with a long
slant, to 0.455/4. From 0.455/4 to the
orange the transparency is complete.
Absorption begins again in the red.

81. Curcumine S. (A.) Sodium salt of

the so-called azoxy - stilbene - disul-

phonic acid.

Fig- 37> pl- i; No. 399, S. & J.
Brown powder. In solution yellow,

faint yellow.
Saturated.
Angle i 10'. Depth o.n to 0.75 mm.



81. Curcumine S Continued.

Faint absorption in violet. Absorption
decreases from 0.20/1 to 0.29/4. Trans-
parent from 0.29/4 to 0.34/4. Weak
band from 0.34/4 to 0.43/1 with max-
imum at 0.39/4. Transparent from
0.43/4 to 0.63/4.

82. Auramine O. (B.) Hydrochloride of

amido-tetramethyl-diamido-diphenyl-
methane.

Fig. 43, pl. ii ; No. 425, S. & J.

Sulphur-yellow powder. In solution
yellow, faint yellow.

Equal volumes of a saturated solution
and of water (filtered).

Angle 42.5'. Depth o to 0.36 mm.

Strong absorption in violet and indigo.
Relatively transparent at 0.22/4. The
continuous background of the spark
indicates one band or, at most, two
bands from 0.23/4 to 0.275/1. Un-
usually transparent from 0.275/4 to
0.345/1. A pair of partially-resolved
intense bands absorb from 0.345/4 to
0.47/4. Their maxima lie at 0.365/1
and 0.425/4. The intervening, par-
tially-transparent spot is near 0.385/4.
The less refrangible band is the more
intense and is very round. Trans-
parent from 0.470/1 to 0.63/4.

83. Malachite Green. (M.) Oxalate of

tetramethyl - di-^-amido - triphenyl-
carbinol.

Similar to fig. 46, pl. 12; No. 427,
S. & J.

Green, metallic, glistening plates. In so-
lution greenish blue, greenish blue.

3.75 g. per liter.

Angle 25.5'. Depth o to 0.21 mm.

Strong, double band in the orange and
clear red. Deep red is transmitted.
Similar absorption to that of solution
No. 86 from 0.20/4 to the yellow. All
strong lines in the extreme ultra-
violet are transmitted freely. Ab-
sorption band lies between 0.29/4 and
0.33/4. A faint band has its maximum
near 0.425/1. Strong absorption com-
mences at 0.55/1.

84. Emerald Green. (B.) Sulphate or

zinc - double - chloride of tetraethyl-
diamido-triphenyl-carbinol.

Similar to fig. 46, pl. 12; No. 428,
S. & J.

Golden, glistening crystals. In solu-
tion green, green.

4.62 g. per liter.



COLORING MATTERS.



84. Emerald Green Continued.

Angle 31.2'. Depth o to 0.29 mm.

Compound band in the orange and red
with the maximum in the red. The
contour is hazy. Similar absorption
to solution No. 86 from 0.20/1 to the
yellow, save that the band near
0.425/4 is hardly discernible on the
negative. Strong absorption begins
at 0.57/1. For ultra-violet details see
No. 83 above.

85. Light Green F S. (B.) Sodium salt of

dimethy Idibenzy 1 - diamido - triphenyl-
carbinol-trisulphonic acid.

Similar to fig. 46, pi. 12; No. 434,
S. &J.

Brownish-black powder. In solution
green, green.

10 g. per liter.

Angle 21.3'. Depth o to 0.18 mm.

Strong band in the yellow, orange, and
red. Except for concentration, the
absorption is the same as that of so-
lution No. 86, hence for further de-
tails refer to No. 86.

86. Acid Green, concentrated. (C.) Sodium

salt of diethyldibenzyl - diamido - tri-
phenyl-carbinol-trisulphonic acid.

Fig. 46, pi. 12; No. 435, S. &J.

Bright-green, dull powder. In solution
deep green, green.

13-33 g- per liter.

Angle 25.4'. Depth o to 0.23 mm.

Strong band in orange and red with
no return to transparency visible.
Absorption in violet and blue. Ab-
sorption decreases from 0.20/1 to
about 0.275/4. Then a strong band
begins, having its maximum near
0.32/4 and returning abruptly to
transparency at 0.34/4. Transparent
from 0.34/1 to 0.39/4. A round band
extends from 0.39/4 to 0.455/4 with
its maximum at 0.425/4. Transpar-
ent from 0.455/1 to 0.55/4. Strong ab-
sorption commences at 0.55/4 and in-
creases to complete opacity at 0.63/4.
Weaker solutions show conclusively
the transparent region around 0.275/4
and also that the band at 0.425/1 van-
ishes most readily.

87. Fuchsine. (M.) Mixture of hydro-

chloride or acetate of pararosaniline

and rosaniline.

Fig. 48, pi. 12 ; No. 448, S. & J.
Green, crystalline powder. In solution

deep red, red.



87. Fuchsine Continued.

Angle 21.3'. Depth o to 0.18 mm.

Intense band in blue-green and green.
All lines near 0.23/4 and from 0.25/1
to 0.26/4 are freely transmitted. The
background indicates a band with
its maximum at 0.285/1 and extend-
ing from 0.27/4 to 0.305/1. Transpar-
ent from 0.305/1 to 0.45/4. Very
strong absorption from 0.45/4 to
0.575/4 with maximum near 0.53/4.
There are probably two unresolved
bands of which the more refrangible
is the weaker. Transparent from
0.575/4 to 0.63/4. A layer about i mm.
deep limited the more refrangible,
transparent region to the interval
from 0.35/4 to 0.39/4.

88. New Magenta. (O.) Hydrochloride of

triamido-tritolyl-carbinol.

Fig. 50, pi. 13 ; No. 449, S. & J.

Beetle-green powder. In solution red,
bluish red.

6 g. per liter.

Angle 31.2'. Depth o to 0.29 mm.

Strong band in the green, steeper on
the yellow side, and suggesting a
sharp band superposed upon a
weaker one. The band extends from
about 0.44/4 to 0.56/4 with its maxi-
mum near 0.52/1. Transparent from
0.56/4 to 0.63/4.

89. Dahlia. (B.) Mixture of the hydro-

chlorides or acetates of the mono-
di- or tri-methyl (or ethyl) rosani-
lines and pararosanilines.

Fig. 69, pi. 18; No. 450, S. & J.

Green, lumpy powder. In solution deep
blue, reddish violet.

3.57 g. per liter.

Angle 23.4'. Depth o to 0.21 mm.

Absorption commences in the blue-
green, has its maximum in the green-
yellow, and decreases gradually into
the red. Transparent to deep red.
Absorption in ultra-violet is weak.
A band which is definite on the more
refrangible edge commences at 0.48/4
and increases to a maximum at
0.52/4. A weak, unresolved com-
panion joins the last one near 0.57/1
and fades away at 0.62/4.

90. Crystal Violet. (B.) Hydrochloride of

hexamethyl-pararosaniline.
Similar to fig. 66, pi. 17; No. 452,
S. &J.



ATLAS OF ABSORPTION SPECTRA.



90. Crystal Violet Continued.

Cantharides glistening crystals. In so-
lution violet, violet.

1.38 g. per liter.

Angle 42.5'. Depth o to 0.36 mm.

The absorption is the same as that ex-
hibited by solution No. 92, hence see

, the description given below.

91. Ethyl Violet. (B.) Hydrochloride of

hexaethyl pararosaniline.
Fig. 64, pi. 16; No. 453, S. & J.
Green, crystalline powder. In solution

pure, deep blue, pinkish blue.

2 73 S- P er liter -

Angle 27.3'. Depth o to 0.25 mm.

Intense absorption in the green. Very
sharp and abrupt on the blue side
but indefinite on the red border.
Strong lines in the ultra-violet are
transmitted pretty freely. Relative
transparency in the vicinity of 0.265/1.
Absorption ceases about 0.3 1/1 and
from this wave-length to 0.495/1
transparency obtains. At 0.495/1 an
intense band having its maximum at
0.525/1 begins. About 0.585/1 the ab-
sorption becomes relatively weak and
diffuse and continues thus to 0.63/1.

92. Methyl Violet 6 B. (A.) Chiefly a mix-

ture of the hydrochlorides of benzyl-
pentamethylpararosaniline and hexa-
methylpararosaniline.

Fig. 66, pi. 17; No. 454, S. & J.

Metallic, glistening powder. In solu-
tion blue, reddish blue.

2.5 g. per liter.

Angle 31.2'. Depth o to 0.29 mm.

Transmits only blue and pure red in
concentrated solution. The solution
described below showed two bands,
the more intense in the green-yellow
and the weaker in the orange. All
strong ultra-violet lines are trans-
mitted. The chief band starts at
0.50/1, has its maximum at 0.535/1,
and joins its companion about 0.57/1.
The weaker band has its maximum
at 0.595/1 and fades away at 0.615/1.
Transparent from 0.62/1 to beyond
0.63/1.

93. Methyl Green OO. (By.) Zinc-double-

chloride of hepta-methyl-pararosani-

line-chloride.
Similar to fig. 47, pi. 12; No. 460,

S. & J.
Green crystals. In solution greenish

blue, greenish blue.



93. Methyl Green OO Continued.

6 g. per liter.

Angle 19.5'. Depth o to 0.18 mm.

Band in violet and blue, also strong
absorption in orange and red. The
band in the orange is partly sepa-
rated from the stronger band whose
intensity increases to, and beyond,
0.63/1. With due allowance for dif-
ferences in concentration, it ap-
pears that the absorption is, in
toto, the same as that shown by
solution No. 94. Absorption de-
creases from 0.20/1 to a region of
less intense absorption at 0.28/1.
Then follows a strong band with
maximum at 0.315/1. A band from
0.375/1 to 0.445/1 has its maximum
at 0.415/1. The yellow and orange
band begins at 0.515/1.

94. Methyl Green. Zinc-double-chloride of

ethylhexamethyl - pararosaniline bro-
mide.

Fig 47, pi. 12; No. 461, S. & J.

Moss-green, crystalline powder. In
solution bluish green, bluish green.

20 g. per liter.

Angle 19.5'. Depth o to 0.18 mm.

Band in violet and blue, also strong
absorption in orange and red. Trans-
mits green and yellow-green. Band
from 0.36/1 to 0.45/1 with maximum
at 0.415/1. This band is steeper on
its green side. Very transparent
from 0.45/1 to 0.495/1. From 0.495/1
the absorption is intense and no re-
turn to transparency can be seen at
0.63/1. The band at 0.415/1 disap-
pears first on dilution.

95. Fuchsine S. (B.) Mixture of the so-

dium or ammonium salts of the tri-
sulphonic acids of rosaniline and
pararosaniline.

Fig. 53, pi. 14; No. 462, S. & J.

Metallic, green, glistening powder. In
solution red, red.

3 g. per liter.

Angle 23.4'. Depth o to 0.21 mm.

Strong absorption in the blue-green
and green. The middle of the first
transparent region is about 0.265/1.
A weak absorption band has its
maximum near 0.295/1. The visible
band commences at 0.475/1, has its
maximum about 0.535/1, and ends at
0.575/1. Transparent from 0.575/1 to
0.63/1.



COLORING MATTERS.



37



96. Red Violet 5 R S. (B.) Sodium salt of

ethylrosaniline-sulphonic acid.

Fig. 62, pi. 16; No. 463, S. & J.

Brownish - violet, metallic, glistening
lumps. In solution brownish red,
brownish red.

Saturated.

Angle 58.5'. Depth o to 0.54 mm.

General absorption in the green, yel-
low, and orange. The ultra-violet
absorption is complete from 0.20/1.
to 0.361*. Absorption decreases
gradually from 0.36/4 to a minimum
of general absorption near 0.47/4. A
weak band has its maximum about
0.525/1. The marked slant of the end
of the negative shows the presence
of appreciable general absorption in
the yellow and orange. Red is trans-
mitted.

97. Alkali Blue 6 B. (A. A. C.) Sodium

salt of triphenyl-/>-rosaniline - mono-
sulphonic acid.

Fig. 72, pi. 18; No. 476, S. & J.

Blue powder. In solution blue, deli-
cate blue.

12.5 g. per liter (heated).

Angle 23.4'. Depth o to 0.21 mm.

Strong absorption in yellow, orange,
and red. Intense, continuous absorp-
tion from 0.20/4 to 0.32/1. Abrupt
decrease in absorption from 0.32/4 to
transparency at 0.345/1. Transparent
from 0.345/4 to 0.51/1. Strong ab-
sorption from 0.51/1 to beyond 0.63/4.
No decrease in absorption as far as
0.63/1. The apparent increase in ab-
sorption near 0.62/4 is due to the
relative diminution of sensitiveness
of the photographic emulsion.

98. Methyl Blue. (O.) Sodium salt of tri-

phenyl - pararosaniline - trisulphonic
acid.

Similar to fig. 71, pi. 18; No. 479,
S. &J.

Dark-blue powder. In solution deep,
bright blue, blue.

6.89 g. per liter.

Angle 21.3'. Depth o to 0.18 mm.

Strong absorption in the yellow, orange,
and red. The description for solu-
tion No. 99 holds here quantitatively.

99. China Blue. (A.) Sodium salt of the

trisulphonic acid of triphenylrosani-
line and triphenylpararosaniline.
Fig. 71, pi. 18; No. 480, S. & J.



99. China Blue Continued.

Coppery flakes. In solution blue, blue.

3.57 g. per liter (filtered).

Angle 23.4'. Depth o to 0.21 mm.

A hazy-edged band begins in the green
and continues into the red. The
strong lines around 0.255/4 are trans-
mitted by the deepest layer of liquid.
Absorption is more or less uniform
from 0.20/4 to 0.32/1 and then shades
off to transparency at 0.345/4. Trans-
parent from 0.345/4 to 0.505/4. Then
a band starts and continues with un-
diminished intensity to 0.63/4.

100. Coralline Red. Dioxy-amido-triphenyl-

carbidrid.

Fig. 49, pi. 13 ; No. 484, S. & J.

Reddish-brown lumps. In solution red,
salmon pink.

11.25 if- P er liter (heated).

Angle 19.5'. Depth o to 0.18 mm.

Sharp band in blue and green. Very
definite at yellow side with maxi-
mum in green-yellow. Rather strong
absorption from 0.20/4 to 0.27/4, then
a decrease to transparency at 0.315/4.
Strong absorption from 0.445/4 to
o-SS?/* with maximum at 0.527/4.
Probably two unresolved bands with
the weaker component at the more
refrangible side. Transparent from
Q-557/* to 0.63/4.

101. Night Blue. (B.) Hydrochloride of

/>-tolyltetraethyl-triamido - diphenyl-
a-naphthyl-carbinol.

Similar to fig. 70, pi. 18; No. 489,
S. & J.

Violet, bronzy powder. In solution
bright blue, blue.

2.31 g. per liter.

Angle 23.4'. Depth o to 0.21 mm.

Absorption in the yellow, orange, and
red. The limit at the green side is
steep and the curve is flat in the
longer wave-lengths. The visible re-
gion of absorption begins about
0.525/4. For the ultra-violet absorp-
tion see fig. 70.

102. Victoria Blue 4 R. (B.) Hydro-

chloride of phenylpenta-methyl-tri-

amido-diphenyl - a - naphthyl - car-

binol.

Fig. 70, pi. 18; No. 490, S. & J.
Bronzy, glistening powder. In solution

deep blue, reddish blue.
2.78 g. per liter (heated).
Angle 27.3'. Depth o to 0.25 mm.



ATLAS OF ABSORPTION SPECTRA.



1 02. Victoria Blue 4 R Continued.
Hazy-edged absorption in yellow and

orange. The red is only partially
absorbed. Comparatively weak ab-
sorption decreases steadily from
0.20/1, to about 0.335/1. A band com-
mences at 0.495/1 and continues to a
maximum at 0.53/1. From this point
the band shades off gently towards
the red. (The apparent increase of
absorption at 0.62/1 is probably due
to the increasing lack of sensitive-
ness of the plate.)

103. Rhodamine B. (B.) Hydrochloride of

diethyl-w-amido-phenol-phthaleine.
Fig. 65, pi. 17; No. 504, S. & J.
Reddish-violet powder. In solution

bluish red, violet.
7.5 g. per liter.

Angle 42.5'. Depth o to 0.36 mm.
Two distinct bands, the one in the yel-
low-orange and the other in the
green-yellow. Eye observations,
changes in concentration, and differ-
ent makes of films show that the
more refrangible band is the more
intense. Fluorescent solution. Ab-
sorption decreases gradually from
0.20/4 to an indefinite limit near 0.32/4.
Strong absorption from 0.494/1 to
about 0.59/1. The maxima are at
0.524/1 and 0.557/1 with the inter-
vening minimum of absorption at
0.54/1. Transparent beyond the
orange band into the red.
104. Fast Acid Violet B. (M.) Sodium
salt of diphenyl - m - amido-phenol-
phthalem sulphonic acid.
Fig. 63, pi. 16; No. 506,5. & J.
Maroon powder. In solution bluish

red, pink.
3-33 S- P er liter.

Angle 27.3'. Depth o to 0.25 mm.
Absorption band in the green-yellow.
This band is comparatively definite
on the green side and has a shadowy
companion on the red side. General
absorption continues well into the
orange-red. All strong lines in the
ultra-violet are transmitted. The
ultra-violet absorption ends about
-33/ i - The visible band begins at
0.505/1 and has its maximum near
0.53/1. The less refrangible limit is
indeterminate. The essential differ-
ence between the spectrograms for
solutions Nos. 104 and 106 is that



104. Fast Acid Violet B Continued.

for the former the visible band is
asymmetric, whereas for the latter
it is symmetric.

105. Fast Acid Violet A 2 R. (M.) Sodium

salt of di-o-tolyl - m - amido-phenol-
phthalein-sulphonic acid.

Similar to fig. 19, pi. 5 ; No. 507, S. & J.

Violet-red powder. In solution red,
pink.

4-67 g. per liter.

Angle 23.4'. Depth o to 0.21 mm.

Very narrow, definite band in the
green. All strong ultra-violet lines
are transmitted. The ultra-violet ab-
sorption ends about 0.335/1. The
visible band begins at 0.495/4, has its
maximum at 0.525/1, and ends near
0.57/4. The slanting end of the spec-
trogram indicates general absorption
in the deep yellow. The green band
for this solution is of the same type
as the corresponding one for No.
104, although it is much less asym-
metric, and therefore it resembles
more closely No. 106. The spectrum
of solution No. 105 is best described


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