COLORING MATTERS. 



45 



139. Carthaniin 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 & per 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 o.20;a 

 to about o.53;tt. At this point it ends 

 rather abruptly. Transparent from 

 0.53^ to 0.63/*. 



142. Fluoresceine. Tetraoxypthalophenone 



anhydride C20H12O5+H2O. 



Cinnabar-red powder. In solution faint 

 yellow. 



Saturated (boiled). 



Angle 0. Depth 3.7 mm. 



Weak band, in blue and blue-green. 

 Intense, green fluorescence. Absorp- 

 tion complete from 0.20/^ to o.25;u 

 and then decreases to transparency 

 at o.29/i. Weak absorption ex- 

 tends from about 0.46/1. to O.505JU.. 



143. Guinea Carmine B. (A.) 

 Similar to fig. 20. pi. 5. 



Brown powder. In solution red, pink. 



Saturated. 



Angle 2 17'. Depth 0.26 to 1.51 mm. 



Absorption in green. No lines trans- 

 mitted between 0.20/* and 0.273/1. 

 (Non-zero depth of liquid.) Weak 

 absorption from 0.273/t to 0.33/1. 

 Transparent from 0.33/t to 0.493/1. 

 A hazy-edged band extends from 

 o.493/(, to 0.548/1 with its maximum 

 at 0.521/1. Transparent from 0.548/1 

 to 0.63/1. The spectrogram for solu- 

 tion No. 143 does not slant at the 



143. Guinea Carmine B Continued. 



red limit, whereas that for solution 

 No. 127 does. 



144. Orcein. 



Suggested by figs. 20 and 21 of pis. 

 5 and 6, respectively. 



Black powder with reddish tinge. In 

 solution deep red, light red. 



Saturated (heated and filtered). 



Angle 31.2'. Depth o to 0.29 mm. 



Weak, narrow band in the yellow. The 

 ultra-violet absorption is similar to 

 that of solution No. 127. The ab- 

 sorption in the visible spectrum is 

 .somewhat like that of solution No. 

 46. However, the band in the yel- 

 low is very much weaker and nar- 

 rower for solution No. 144 than for 

 the corresponding band of solution 

 No. 46. Strong absorption from 

 0.20/1 to o.27/t was followed by a 

 gradual decrease to transparency 

 near 0.33/1. Transparent froui 0.33/1 

 to about 0.515/t. A narrow, hazy- 

 edged absorption band, with its 

 maximum at 0.525/t, extended from 

 0.515/1 to 0.542/1 approximately. The 

 very marked slant of the end of the 

 spectrogram showed the presence of 

 comparatively intense, general ab- 

 sorption in the orange. 



145. Soluble Prussian Blue. 



Deep-blue, glistening powder. In so- 

 lution deep blue, blue. 



1.76 g. per liter. 



Angle 21.3'. Depth o to 0.18 mm. 



Strong absorption in the yellow, 

 orange, and red. Almost opaque 

 from 0.20/1 to 0.28/1. Absorption 

 decreases very gradually from 0.28/* 

 to 0.38/1. The visible region of ab- 

 sorption begins at 0.505/1 and con- 

 tinues to 0.63/1 and beyond. 



146. Thiogene Brown S. (M.) 

 Similar to fig. 11, pi. 3. 

 Bluish-black lumps. In solution dull 



brown, brown. 



Saturated. 



Angle 27.3'. Depth o to 0.25 mm. 



General weakening of all the visible 

 spectrum except the blue and red. 

 The solution smells strongly of 

 hydrogen sulphide. (The odor is 

 not so marked for the dry dye.) 

 Similar absorption to that of solu- 

 tion No. 47. Absorption decreases 

 very gradually from 0.20/1 to about 



