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Very weak, general, indefinite absorp-
tion for all visible colors of shorter
wave-lengths than the yellow. Sim-
ilar absorption to that of solution
No. 47. Absorption was nearly com-
plete from 0.20/1 to 0.274/1. From



26



ATLAS OF ABSORPTION SPECTRA.



33. Naphthylamine Brown Continued.

the latter wave-length the absorption
decreased very gradually to a maxi-
mum of semi-transparency at about
0.43/1. The apparent absorption at
0.52/1 is much exaggerated by the
lack of relative sensitiveness of the
photographic film at this spot. Very
slight absorption from 0.55/4 to 0.63/1.
A weaker solution presented only
ultra-violet absorption.

34. Fast Red A. (A.) New Coccine O.

(M.) Sodium salt of />-sulphonaph-
thalene-azo-/?-naphthol.

Fig. 27, pi. 7; No. 102, S. & J.

Brownish-red powder. In solution red,
pink.

5 g. per liter (heated).

Angle 27.3'. Depth o to 0.25 mm.

Hazy absorption in blue-green and
general absorption in blue. Muddy-
looking solution. Two partially re-
solved bands extend from 0.415/1 to
0.54/1 with maxima of absorption at
about 0.45/1 and 0.505/1. The less
refrangible band is the more intense.
Orange and red are transmitted, but
the sloping end of the photograph
shows that slight, general absorption
is present in orange. Nos. 33 and 34
have the same empirical formulae.
They differ by a and ft naphthol.

35. Azo Rubine S. (A.) Sodium salt of

/"-sulphonaphthalene - azo-o-naphthol-
/>-sulphonic acid.

Similar to fig. 55, pi. 14; No. 103,
S.&J.

Brown powder. In solution red, pink.

10 g. per liter.

Angle 19.5'. Depth o to 0.18 mm.

Absorption in green. Much like solu-
tion No. 17 with slight differences in
the ultra-violet. Absorption decreases
from 0.20/1 to 0.27/1. The strong lines
at 0.255/1 and 0.275/1 are transmitted
by the deepest layer. Absorption in-
creases from 0.27/1 to a maximum at
0.315/1. Then the absorption de-
creases to approximate transparency
at 0.36/1. Transparent from 0.36/1 to
0.465/1. Strong band from 0.465/1 to
-555M with maximum at 0.51/1. The
visible band is in the same place as
the like band of No. 20, but the
ultra-violet is different. Transparent
to orange and red.



36. Fast Red, extra. (A.) Sodium salt of

/>-sulphonaphthalene-azo-j8-naphthol-
monosulphonic acid.

Similar to fig. 55, pi. 14; No. 105,
S.&J.

Reddish-brown powder. In solution
red, pink.

7 g. per liter.

Angle 27.3'. Depth o to 0.25 mm.

Absorption in blue-green and green.
Absorption the same throughout as
for No. 35 except the position of
the visible band. No. 36 absorbs
from 0.460/1 to 0.545/1 with the max-
imum at 0.505/1. Same empirical
formula as for No. 35.

37. New Coccine. (A.) Sodium salt of

^-sulphonaphthalene-azo-/3-naphthol-
disulphonic acid.

Similar to fig. 52, pi. 13; No. 106,
S. & J.

Scarlet-red powder. In solution yel-
lowish red, pink.

10 g. per liter.

Angle 23.4'. Depth o to 0.21 mm.

Absorption in blue-green and green.
Similar absorption to that of solu-
tion No. 21. The ultra-violet absorp-
tion of solution No. 37 seems to con-
sist only of one band whereas that
of solution No. 21 seems to be separ-
ated into two bands by a minimum of
absorption near 0.274/1. Absorption
decreases from 0.20/1 to transparency
about 0.37/1. A strong, round band
from 0.445/1 to 0.56/1 has its maxi-
mum at 0.51/1. Transparent from
0.56/1 to 0.63/1.

38. Fast Brown 3 B. (A.) Sodium salt of

sulphonaphthalene-azo-a-naphthol.

Similar to fig. 23, pi. 6 ; No. 1 1 1, S. & J.

Dark-brown, glistening powder. In so-
lution reddish brown, faint brown.

15 g. per liter.

Angle 27.3'. Depth o to 0.25 mm.

Absorption most intense in blue-green
and green with slight general absorp-
tion on both sides. Similar absorp-
tion to that of solution No. 60. A
fairly strong band from 0.46/1 to
0.54/1 has its maximum at 0.51/1. No
definite band from 0.54/1 to 0.63/1, but
general absorption is made evident
by the slope of the end of the nega-
tive.



COLORING MATTERS.



39. Mordant Yellow O. (M.) Sodium salt of

sulphonaphthalene-azo-salicylic acid.

Similar to fig. 13, pi. 3 ; No. 1 16, S. & J.

Yellow powder. In solution reddish
yellow, yellow.

10 g. per liter.

Angle 31.2'. Depth o to 0.29 mm.

Absorption in the violet only. Similar
absorption to that of solution No.
129. Strong absorption from 0.20/11
to 0.28/4. Slight weakening of ab-
sorption from 0.28(1. to 0.34/4. Ab-
sorption attains a maximum at 0.36/4
and then slopes gradually, with a
comparatively definite edge, to trans-
parency at 0.44/1. From this point
to 0.63/1 complete transparency ex-
ists.

40. Dianil Yellow R. (M.)

Similar to fig. 37, pi. 10; No. 124,
S. &J.

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

Saturated.

Angle 31.2'. Depth o to 0.29 mm.

Faint absorption in violet. Similar ab-
sorption to that of solution No. 81.
Absorption is comparatively strong
at 0.20/4 and decreases to partial
transparency near 0.295/4. A toler-
ably weak band extends from this
region to about 0.435/4. Its maximum
is indeterminate. Transparent from
0.44/4 to 0.63/4.

41. Resorcine Brown. (A.) Sodium salt of

xylene - azo - resorcin-azo-benzene-^-
sulphonic acid.

Fig. 38, pi. 10 ; No. 137, S. & J.

Brown powder. In solution brown,
yellow.

7.78 g. per liter.

Angle 23.4'. Depth o to 0.21 mm.

Strong absorption in the violet and
blue. A more concentrated solution
exhibited absorption in the green
and yellow. A long band or region
of absorption extends from 0.35/1 to
0.52/4. The maximum is near 0.395/4.
There is a slight minimum of absorp-
tion at 0.48/4. The presence of a
weaker, less refrangible band, in-
creasing in intensity at 0.48/4, is more
marked as the concentration is in-
creased. More concentrated solutions
show that the transparency in the
ultra - violet rapidly disappears,



41. Resorcine Brown Continued.

whereas the bands do not encroach
as rapidly on the yellow. Trans-
parent from 0.53/4 to 0.63/1. The
absorption of the concentrated solu-
tions is like that of solution No. 77,
%. 35-

42. Acid Brown. (D.) Sodium salt of bi-

sulphobenzene-disazo-a-naphthol.

Similar to fig. 39, pi. 10; No. 138,
S. & J.

Brown powder. In solution brown,
yellow.

7.5 g. per liter.

Angle 25.5'. Depth o to 0.21 mm.

Absorption in violet and blue. Similar
absorption to that of solution No. 8.
Very weak absorption from 0.20/4
to 0.29/4. Transparent to continuous
background of spark from 0.29/4 to
0.33/4. Weak, indefinite absorption
band from 0.33/4 to 0.48/4, with max-
imum indeterminate. Transparent to
yellow, orange, and red.

43. Ponceau B O, extra. (A.) Sodium salt

of benzene-azo-benzene-azo-j8-naph-
thol-disulphonic acid.

Similar to fig. 52, pi. 13; No. 146,
S. & J.

Light-brown powder. In solution yel-
lowish red, pink.

7 g. per liter.

Angle 21.5'. Depth o to 0.20 mm.

Strong absorption in blue and green.
Similar absorption to that of solu-
tion No. 21. Absorption decreases
from 0.20/4 to 0.295/4, and then in-
creases to a maximum near 0.345/4.
This band fades to semi-transparency
about 0.4/4. The width and general
appearance of the region of separa-
tion between the ultra-violet bands
and the band in the green resembles
much more closely the correspond-
ing region for solution No. 48 than
for solution No. 21. Transparency
continues from 0.4/4 to 0.44/4, where a
strong, round band begins. The last
band ends at 0.565/4. Its maximum is
at 0.51/4. Transparent from 0.565/4
to 0.63/4. Absorption from this band
moves more rapidly towards the
ultra-violet than towards the red,
with increasing concentration. Same
empirical formula as No. 42.



28



ATLAS OF ABSORPTION SPECTRA.



44. Janus Red B. (M.) Chloride of tri-

methyl-amido- benzene - azo - m - tol-
uene-azo - naphthol.

Similar to fig. 23, pi. 6 ; No. 149, S. & J.

Reddish-brown powder. In solution
yellowish red, faint yellowish red.

Saturated.
: ; ' -Angle S4.6 7 . Depth o to 0.50 mm.

Pointed, V-shaped, weak band in the
blue-green. Similar absorption to
that of solution No. 60. Absorption
is strong at 0.20/1 and decreases
gradually and in a poorly defined
manner to transparency at 0.375/1.
The transparent region continues to
0.455/1. An absorption band lies be-
tween 0.455/1 and 0.540/1, with its
maximum at 0.51/1. Slight general
absorption in the yellow and orange,
but transparent to the red.

45. Cloth Red G. (O.) Sodium salt of

toluene - azo-toluene-azo-/?-naphthol-
monosulphonic acid.

Fig. 25, pi. 7; No. 153, S. & J.

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

8.33 g. per liter (heated and filtered).

Angle 31.2'. Depth o to 0.29 mm.

Bands in blue-green and green with
hazy edges and weak general ab-
sorption in both directions. A band
extends from 0.445/1 to 0.55/1 and ap-
pears to be composed of a stronger
band with a weaker, more refrangible,
unresolved companion. Their maxi-
mum of absorption is at 0.515/1. The
slant at the end of the negative shows
that weak, general absorption is ex-
erted in the orange. Transparent to
the red.

46. Cloth Red O. (M.) Sodium salt of

toluene - azo-toluene-azo-/?-naphthol-
disulphonic acid.

Fig. 21, pi. 6; No. 154, S. & J.
-' Dark-brown powder. In solution deep
red, very faint red.

6.36 g. per liter (warmed and filtered).

Angle 33.2'. Depth o to 0.30 mm.

Maximum of absorption in blue-green
with weak absorption in yellow and
orange. Absorption band starts at
0.485/1, attains its maximum at 0.52/4,
and is dissipated m weak general ab-
sorption about 0.555/1. The end of
the ' negative slants appreciably.
Transparent to red.



47. Cloth Red 3 G A. (A.) Sodium salt of

toluene - azo-toluene-azo-/J-naphthyl-
amine-monosulphonic acid.

Fig. n, pi. 3; No. 155, S. & J.

Brownish-red powder. In solution red-
dish brown, light brown.

Saturated (heated).

Angle i 57'. Depth o to 1.07 mm.

General absorption in violet, also a
maximum of absorption in the blue-
green and green. Absorption is about
complete at 0.20/1 and increases very
gradually, with hazy contour, to
semi-transparency at about 0.42/1.
Semi-transparency from 0.42/1 to
0.49/1. Weak band from 0.49/1 to
0.54/1. Transparent from 0.54/1 to
0.63/1.

48. Ponceau 4 R B. (A.) Sodium salt of

sulphobenzene - azo - benzene - azo-/?-
naphthol-monosulphonic acid.

Fig. 51, pi. 13 ; No. 160, S. & J.

Reddish-brown powder. In solution
yellowish red, pink.

10 g. per liter (heated).

Angle 19.5'. Depth o to 0.18 mm.

Strong absorption in blue-green and
green. At 0.455/1 the strong band be-
gins and extends to 0.565/1, with its
maximum about 0.51/1. Transparent
from 0.565/1 to 0.63/1.

49. Biebrich Scarlet. (K.) Sodium salt of

sulphobenzene - azo - sulphobenzene -
azo-/?-naphthol.

Similar to fig. 51, pi. 13; No. 163,
S. & J.

Reddish-brown powder. In solution
red, pink.

6 g. per liter.

Angle 19.5'. Depth o to 0.18 mm.

Absorption band in blue-green and
green. Absorption decreases from
0.20/1 to about 0.32/1, where a semi-
transparent region appears. This is
followed by an absorption band with
its maximum at 0.355/1. Slight ab-
sorption from 0.39/1 to 0.45/1. A defi-
nite band starts at 0.45/1, reaches a
maximum near 0.51/1, and ends at
0.555/1. Transparent from 0.555/1 to
0.63/1. A solution of 10 g. per liter
showed almost complete absorption
from 0.20/1 to 0.36/1. From 0.395/1 to
0.445/1 only the first photographic
strip received light. The band is very
round from 0.445/1 to its end at



COLORING MATTERS.



49. Biebrich Scarlet Continued.

0.585/11. Transparent to orange and
red. Same empirical formula as No.
48 and almost identical visible ab-
sorption.

50. Wool Black. (A.) Sodium salt of sul-

phobenzene-azo - sulphobenzene-azo-
/>-tolyl-/?-naphthylamine.

Fig. 67, pi. 17; No. 166, S. & J.

Bluish-black powder. In solution pur-
ple, light purple.

5.56 g. per liter (filtered).

Angle 35.1'. Depth o to 0.32 mm.

Hazy band in yellow spreading indefi-
nitely into the orange. Transmits
bright red. At 0.49/1 a region of ab-
sorption commences which seems to
consist of a hazy central band with
a weak, washed-out companion on
each side. The chief maximum is
about 0.54/1. Absorption is very weak
from 0.60/1 to 0.63/1. A very concen-
trated solution shows that the max-
imum of transparency is near 0.44/1.

51. Ponceau 6 R B. (A.) Sodium salt of

sulphotoluene - azo - toluene - azo - /3-
naphthol-a-sulphonic acid.

Fig. 56, pi. 14 ; No. 169, S. & J.

Reddish-brown powder. In solution
scarlet red, pink.

5-38 g. per liter.

Angle 31.2'. Depth o to 0.29 mm.

Strong band in the green which is
more definite on the blue side than
on the yellow border. Strong band
from 0.465/1 to 0.565/1. The maxi-
mum is at 0.51/4. The band is prob-
ably composed of two unresolved
bands of which the weaker lies nearer
the red. Transparent from 0.565/1 to
0.63/1.

52. Blue-Black. (B.) Sodium salt of sulpho-

/3-naphthalene - azo - o - naphthalene-
azo-/?-naphthol-disulphonic acid.

No. I86.S. & J.*

Bluish-black powder. In solution bluish
violet, violet.

6.69 g. per liter (filtered).

Angle 33.2'. Depth o to 0.30 mm.

Very indefinite absorption in green-
yellow, yellow, and orange, with
maximum in yellow. Absorption is
strong at 0.20/1 and decreases gradu-
ally to about 0.34/1. Approximately
transparent from 0.4/1 to 0.5/1. Ab-
sorption starts near 0.50/1, increases
to a maximum about 0.54/1, and de-



52. Blue-Black Continued.

creases to weak, general absorption
from 0.58/1 to 0.63/1.

53. Anthracene Yellow C. (C.) Sodium

salt of thio-di-benzene-disazo-di-sali-
cylic acid.

Similar to fig. 37, pi. 10; No. 190,
S. & J.

Brownish-yellow powder. In solution
muddy yellowish brown, greenish
yellow.

6 g. per liter (filtered).

Angle 21.3'. Depth o to 0.18 mm.

Absorption in violet. Somewhat sim-
ilar absorption to that of solution
No. 8r. However, the absorption of
solution No. 53 is more intense than
that of solution No. 81. Absorption
decreases from 0.20/1 to a semi-trans-
parent strip at about 0.295/1. Beyond
this strip a band with hazy contour
extends as far as 0.41/1 with its max-
imum at about 0.34/1. Transparent
from 0.41/1 to 0.63/1.

54. Bismarck Brown. (A.) Hydrochloride

of benzene-disazo-phenylene-diamine.
Fig. 7, pi. 2; No. 197, S. &J.
Dark-brown powder. In solution brown,

yellow.

30 g. per liter (filtered).
Angle 19.5'. Depth o to 0.18 mm.
Visible and photographic absorption

identical with that of solution No. 12.

55. V e s u v i n e. (B.) Hydrochloride of

toluene-disazo-w-tolylene-diamine.

Fig. 7, pi. 2; No. 201, S. & J.

Dark-brown powder. In solution red-
dish brown, yellow.

4.29 g. per liter.

Angle 31.2'. Depth o to 0.29 mm.

Visible and photographic absorption
identical with that of solution No. 12.

56. Congo Orange G. (A.) Sodium salt of

diphenyl - disazo-phenetol-/?-naphthyl-
amine-disulphonic acid.

Fig. 33, pi. 9 ; No. 217, S. & J.

Brownish-red powder. In solution red-
dish yellow, yellow.

5.38 g. per liter.

Angle 23.4'. Depth o to 0.21 mm.

Hazy absorption in blue, blue-green,
and green with maximum in the
green. Tolerably strong absorption
decreases from 0.20/1 to a weak mini-
mum near 0.32/1 and then increases
to a maximum about 0.36/1. A
semi-transparent region lies between



*Spectrogram too indefinite for reproduction.



ATLAS OF ABSORPTION SPECTRA.



56. Congo Orange G Continued.

0.405/1. and 0.44/1. A weak, hazy band
begins at 0.44/4 and continues to
0.475/1, at which point it joins a
more intense band. The latter has
its maximum at 0.505/1 and then de-
creases to transparency at 0.53/1.
Transparent from 0.53/4 to 0.63/1.
More concentrated solutions empha-
size all the maxima of absorption
just outlined and the minimum at
0.42/1.

57. Chrysamine G. (A.) Sodium salt of

diphenyl-di sazo-bi-salicylic acid .

Similar to fig. 36, pi. 9 ; No. 220, S. & J.

Yellowish-brown powder. In solution
brownish yellow, faint yellow.

7 g. per liter (heated and filtered).

Angle 35.1'. Depth 0.26 to 0.58 mm.

No visible absorption unless, perhaps,
a faint weakening of the extreme
violet. Somewhat similar absorption
to that of the more dilute solution of
No. 77. For the layer used the ab-
sorption is nearly complete from
0.20/1 to 0.29/1. The continuous back-
ground is transmitted from 0.29/1 to
0.30/1. The limit of the ultra-violet ab-
sorption is approximately a straight
line joining the wave-lengths 0.365/1
and 0.395/1 at the opposite edges of
the negative. Transparent from
0.395/1 to 0.63/1. More dilute solu-
tions and wedges of liquid tapering
to infinitesimal thickness show that
ultra-violet absorption is very weak.

58. Cresotine Yellow G. (M.) Sodium salt

of diphenyl - disazo-bi-o-cresol - car-
boxylic acid.

Similar to fig. 36, pi. 9 : No. 221, S. & J.

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

Saturated.

Angle 39.0'. Depth o to 0.36 mm.

Absorption in violet and indigo. Ab-
sorption much like that of the more
dilute solution of No. 77. The solu-
tion has a peculiar odor. A washed-
out band begins at 0.31/1, passes
through a maximum near 0.355/1,
and then fades away at 0.44/1. A
rather narrow region of semi-trans-
parency, the center of which is near
0.30/1, separates this band from a
weak, more refrangible ultra-violet
band. Transparent from 0.44/1 to
0.63/1.



59. Congo Red. (A.) Sodium salt of

diphenyl-disazo-bi-naphthionic acid.

Similar to fig. 26, pi. 7 ; No. 240, S. & J.

Reddish-brown powder. In solution
red, yellowish red.

5.9 g. per liter.

Angle 27.3'. Depth o to 0.25 mm.

Absorption in blue, blue-green, and
green with maximum nearer the
green end. Similar absorption to that
of solution No. 69. Absorption de-
creases from 0.20/1 to near 0.28/1 and
then increases to a maximum at
about 0.325/1. These two partially
resolved bands are followed by a re-
gion of approximate transparency
extending from 0.385/1 to 0.426/1 with
its maximum at 0.405/1. Transpar-
ency is terminated at 0.426/1 by a
pair of wide, hazy bands of which
the more refrangible is the weaker.
The chief maximum is at 0.505/1.
Absorption ends at 0.545/1. Trans-
parent from 0.545/1 to 0.63/1. More
concentrated solutions show that the
ultra-violet and visible bands soon
run together, whereas the absorption
does not advance much towards the
orange.

60. Congo Corinth G. (A.) Sodium salt

of diphenyl - disazo - naphthionic-o-
naphthol-sulphonic acid.

Fig. 23, pi. 6 ; No. 242, S. & J.

Greenish-black powder. In solution
brownish red, red.

5.38 g. per liter (heated).

Angle 27.3'. Depth o to 0.25 mm.

Absorption in blue-green, green, and
yellow. Very general absorption at
the red border. Absorption band
from 0.46/1 to 0.555/1 with its maxi-
mum near 0.515/1. The end of the
negative slants considerably, show-
ing that general absorption con-
tinues into the orange. Transparent
to red. Same empirical formula as
No. 6r, but different constitution.

61. Congo Rubine. (A.) Sodium salt of

diphenyl-disazo-naphthionic acid - /? -
naphthol-sulphonic acid.

Similar to fig. 19, pi. 5 ; No. 243,
S. & J.

Greenish, crystalline powder. In solu-
tion bluish red, dull red.

Saturated (warmed).

Angle 39.0'. Depth 0.26 to 0.62 mm.



COLORING MATTERS.



61. Congo Rubine Continued.

Absorption in blue-green. Absorption,
especially in the visible spectrum,
similar to that of solution No. 106.
A layer about 2 mm. deep absorbs
all the visible spectrum except the
orange and red. Complete absorp-
tion at 0.20/4 decreases to a minimum
near 0.275/4, then increases to a maxi-
mum at about 0.31/4, and finally van-
ishes in transparency at 0.345/1. Ab-
sorption band from 0.485/4 to 0.55/1
with its maximum at 0.52/1. Trans-
parent from 0.55/1 to 0.63/4. Same
empirical formula as No. 60, but dif-
ferent constitution.

62. Anthracene Red. (I.) Sodium salt

of nitrodiphenyl - disazo - salicylic-a-
naphthol-sulphonic acid.

Similar to fig. 56, pi. 14; No. 262,
S. &J.

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

7.5 g. per liter.

Angle 27.3'. Depth o to 0.25 mm.

Hazy-edged band in the blue-green
and green. Similar absorption to
that of solution No. 51. Absorption
decreases from 0.20/1 to semi-trans-
parency at 0.29/4. About 0.31/4 a well-
rounded, hazy-edged band starts,
passes through its maximum near
0.36/4, and ceases at 0.42/1. Partial
transparency from 0.42/4 to 0.465/4.
A symmetrical absorption band pre-
vents transmission from 0.465/4 to
0.55/4. Its maximum is near 0.51/1.
Transparent from 0.55/4 to 0.63/4.
Less concentrated solutions show
that the ultra-violet absorption is
comparatively weak.

63. Congo Orange R. (A.) Sodium salt of

ditolyl - disazo - phenetol-/?-naphthyl-
amine-disulphonic acid.

Similar to fig. n, pi. 3 ; No. 275, S. & J.

Yellowish-red powder. In solution
brown, yellowish brown.

5 g. per liter (warmed and filtered).

Angle 39.0'. Depth o to 0.36 mm.

Indefinite, general absorption in the
blue and blue-green. The liquid is
not clear, but behaves somewhat like
an emulsion. Similar absorption to
that of solution No. 47. Absorption
decreases from 0.20/1 to about 0.29/4
and then remains about constant as
far as 0.365/4. From this point it de-



63. Congo Orange R Continued.

creases to very weak, general ab-
sorption at 0.43/1. A slight increase
in absorption has its maximum at
0.515/4. It is partly, but not entirely,
due to the weak spot of the Seed
emulsion. Transparent from 0.54/1
to 0.63/4. Deeper layers of greater
concentration show the minimum of
absorption to be the region around

0.455/*-

64. Benzopurpurine 6 B. (A.) Sodium

salt of ditolyl - disazo - bi-a-naphthyl-
amine-sulphonic acid.

Similar to fig. 26, pi. 7 ; No. 278, S. & J.

Red powder. In solution red, brownish
red.

7.78 g. per liter (filtered).

Angle 29.3'. Depth o to 0.27 mm.

Hazy-edged band in blue and green.
Similar absorption to that of solu-
tion No. 69. Strong absorption from
0.415/4 to 0.55/1. The chief maximum
of absorption is at 0.51/4. Probably
two hazy, unresolved bands, with
more refrangible, weaker component.
Transparent from 0.55/1 to 0.63/4.
Weaker solutions show more rapid
increase of transparency on the ultra-
violet side of the visible band than
on the red side.

65. Benzopurpurine B. (A.) Sodium salt

of ditolyl-disazo-bi-/?-naphthylamine-
/J-sulphonic acid.

Similar to fig. 26, pi. 7 ; No. 279, S. & J.

Brown powder. In solution reddish
brown, brown.

8-75 S- Per liter.

Angle 25.4'. Depth o to 0.23 mm.

Same visible and photographic absorp-
tion as No. 69. Identical visible ab-
sorption to that of solution No. 64.
Solutions Nos. 65 and 69 seem to
have only one region of absorption
in the ultra-violet, whereas solution
No. 64 has a slight minimum of ab-
sorption near 0.275/4. Nos. 64 and
65 have the same empirical formulae,
but different chemical constitution.

66. Diamine Red B. (A.) Deltapurpurine

56. (M.) Sodium salt of ditolyl-

disazo-bi-^-naphthylamine - sulphonic

acid.

Similar to fig. 26, pi. 7 ; No. 280, S. & J.
Reddish-brown powder. In solution

yellowish red, pink.



ATLAS OF ABSORPTION SPECTRA.



66. Diamine Red B Continued.

6.36 g. per liter (warmed and filtered).

Angle 25.4'. Depth o to 0.23 mm.

Same visible absorption as No. 64.
Similar absorption to that of solution
No. 69. Nos. 64 and 66 have the
same empirical formulae, but differ-
ent chemical constitutions.

67. Brilliant Congo R. (A). Sodium salt

of ditolyl-disazo -ft- naphthylamine-
monosulphonic - /J-naphthylamine-di-
sulphonic acid.

Similar to fig. 26, pi. 7 ; No. 281, S. & J.

Brown powder. In solution, yellowish
red, yellowish red.

8 g. per liter.

Angle 31.2'. Depth o to 0.29 mm.

Hazy-edged band in blue and green.
Similar absorption to that of solution
No. 69. A pair of unresolved bands
extends from 0.42/1 to 0.56/1, with
their chief maximum at 0.515/1. The
less refrangible band is the more in-
tense. Transparent from 0.555;* to
0.63/1.

68. Diamine Red 36. (A.) Sodium salt

of ditolyl-disazo-bi-/?-naphthylamine-
8-sulphonic acid.

Fig. 61, pi. 16; No. 282, S. & J.

Reddish-brown powder. In solution
reddish brown, brown.

7 g. per liter (heated and filtered).

Angle 5O./. Depth 0.64 mm. to i.io
mm.

Hazy-edged absorption in the blue-
green and green A pair of unre-
solved bands absorbs from about
0.435/1 to 0.545/1. Their maximum
is near 0.515/1. The more refrangible


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