172 PLANT AND ORGANIC CHEMISTRY 
The following is a table of dyewood colors with reagents, 
yielded by Brazil wood and logwood: 1 — 
Reagents. 
Brasilin. 
Hcematoxylin. 
Alkalies. 
Claret-red sol... 
Reddish purple sol. 
Pink sol. 
Acids (dilute). 
Orange ppt. 
Acids (strong). 
Yellow ppt. 
Pink sol. 
Alum sol. 
Crimson-red ppt. 
Yellow, then violet sol. 
Bluish purple ppt. 
Lime-water. 
Crimson-red ppt. 
Ferrous salts. 
Purplish-bl’k ppt. 
Bluish black ppt. 
Ferric salts. 
Brownish-red ppt. 
Black ppt. 
Purple sol. 
Copper salts. 
Brownish-red ppt. 
Lead salts. 
Crimson-red ppt. 
Violet sol. 
Mercuric salts. 
Yellow ppt. 
Yellow sol. 
Silver salts ... 
Yellow ppt. 
Gray ppt. 
Tartar emetic. 
Rose-colored ppt. 
Purple sol. 
Stannous chloride .... 
Red ppt. 
Purple ppt. 
Sodium aluminate .... 
Claret-red ppt. 
Purple ppt. 
The extracts of Saraca Indica bark, containing the coloring 
principle, were tested with these reagents, and it was observed 
that the reactions agreed with the hasmatoxylin colors, and in 
no case with those of brasilin. However, the colors produced 
by different alkalies varied in tints as she had found in both the 
logwood and Saraca extracts, but the general term “reddish- 
purple solution” is comprehensive. A rose-violet precipitate 
was yielded by stannous chloride solution with the neutralized 
acidified extracts of the barks. 
The bark of the logwood-tree is not used for making the 
commercial logwood extracts, the wood of the tree being em¬ 
ployed for this purpose. The presence of a small quantity of 
hsematoxylin was determined in the specimens of logwood- 
bark which she examined, and with the bark extracts the same 
reactions with reagents were obtained as with the logwood 
extracts, but owing to the smaller percentage of dye in the 
bark the colors were less intense. In the case of the Saraca 
Indica bark the colors were very brilliant and indicated the 
1 S. P. Sadtler and Wm. L. Rowland, Am. Jour, oj Phar., February, 1881. 
