COLORING MATTERS. 



41 



117. Phospliiiie. (M.) Nitrate of chrysaiii- 



line ( iiiis}!!!. diamido - phenyl - acri- 

 dine) and homologues. 



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



Orange-yellow powder. In solution 

 brown, yellow. 



11.25 t?- per liter (heated and filtered). 



.\ngle 27.3'. Depth o to 0.25 mm. 



Absorption in violet, blue, and green 

 with hazy limits. Strong absorption 

 from o.20ytt to 0.295/n, then weaken- 

 ing to semi-transparency at 0.325/^. 

 Next a band with maximum at 

 0.36/4. Return to partial transpar- 

 ency at 0.41/X. Then follow two un- 

 resolved bands with maxima about 

 0.458/4 and 0.50/1. Complete trans- 

 parency from 0.52/4 to 0.62/1. A solu- 

 tion so concentrated as to absorb all 

 the ultra-violet and visible spectrum 

 from 0.20/4 to 0.538/1 was transpar- 

 ent to 0.63/1. 



1 18. Alizarine Brown. (M.) Trio.xyanthra- 



quinone. 



Similar to fig. 11, 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 0.20/1 to 0.33/1. From 

 0.33/4 the absorption decreases very 

 gradually and nearly linearly to 

 about 0.47/t. A very weak band with 

 its maximum at 0.52/4 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/t. 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 0.20/4 to 0.275/1. Absorption 

 decreases gradually from 0.275/1 to 

 partial transparency at 0.377/1, and 



119. Alizarine Red S Continued. 



then increases to a maximum at 

 0.42/1. Absorption ends at 0.485/1. 

 No visible absorption from 0.49/4 to 

 0.63/4. 



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



phite compound of dioxy - anthra- 

 quinone-/8-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. 



Ab.sorption in violet, blue, and green. 

 The absorption extends into the 

 ultra-violet. Absorption from 0.20/1 

 to 0.33/4 is almost complete .save a 

 slight weakening around 0.285/4. In- 

 tense maximum at 0.315/t. Absorp- 

 tion decreases abruptly from be- 

 yond 0.33/1 to transparency at 0.36/4. 

 The transparent region is from 

 0.36/4 to about 0.385/1. A pair of 

 wide bands absorbs from 0.385/4 to 

 0.543/4. Their maxima are at 0.44/t 

 and 0.517/4. The intervening mini- 

 mum of absorption is at 0.48/4. 

 Transparent from 0.543/1 to 0.63/4. 

 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 

 tran,sparency at 0.23/t. A band lies 

 between this point and 0.31/4 where 

 transparency begins to be complete. 

 An absorption band extends from 

 0.468/1 to 0.545/4 with its maximum at 

 0.507/4. Transparent from 0.545/4 to 

 0.63/4. 



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. 



