COLORING MATTERS. 



35 



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/x to the 

 yellow, save that the band near 

 0.425;^ is hardly discernible on the 

 negative. Strong absorption begins 

 at 0.57/x. For ultra-violet details see 

 No. 83 above. 



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



dimethyldibenzy 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/t to 

 about 0.275/1. Then a strong band 

 begins, having its maximum near 

 0.32/* and returning abruptly to 

 transparency at 0.34/^. Transparent 

 from 0.34/i to 0.39/i. A round band 

 extends from 0.39/i to 0.455/1 with 

 its maximum at 0.425/1. Transpar- 

 ent from 0.455/1 to 0.55/1. Strong ab- 

 sorption commences at 0.55/1 and in- 

 creases to complete opacity at 0.63/1. 

 Weaker solutions show conclusively 

 the transparent region around 0.275/1 

 and also that the band at 0.425/1 van- 

 ishes most readily. 



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



chloride or acetate of pararosa'niline 



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 0.23/1 and from 0.25/1 

 to 0.26/1 are freely transmitted. The 

 background indicates a band with 

 its maximum at 0.285/1 and extend- 

 ing from 0.27/1 to 0.305/1. Transpar- 

 ent from 0.305/1 to 0.45/1. Very 

 strong absorption from 0.45/1 to 

 -575l^ with maximum near 0.53/1. 

 There are probably two unresolved 

 bands of which the more refrangible 

 is the weaker. Transparent from 

 0-575/^ to 0.63/1. A layer about i mm. 

 deep limited the more refrangible, 

 transparent region to the interval 

 from 0.35/1 to 0.39/1. 



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 0.44/1 to 0.56/1 with its maxi- 

 mum near 0.52/1. Transparent from 

 0.56/1 to 0.63/1. 



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 0.48/1 

 and increases to a maximum at 

 0.52/i. A weak, unresolved com- 

 panion joins the last one near 0.57/1 

 and fades away at 0.62/1. 



90. Crystal Violet. (B.) Hydrochloride of 



hexamethyl-pararosaniline. 

 Similar to fig. 66, pi. 17; No. 452, 

 S. & J. 



