1892. | NEW YORK ACADEMY OF SCIENCES. 177 
Black on Yarn. 
Mordant in bath of 
K.Cr.0.. . >, 4 OL Ein. 
for 14 hours at 100° cs, drain, and dye i in bath of 
Logwood Extract, "51° Tw. . 1.50 gms. 
for 2} hours at “100° C., bath should be acid with Acetic Acid ; allow 
to cool over night in bath, wash, and dry. Results are very good. 
The dyeing with indigo on a small scale not proving successful, 
is omitted; the best results, however, may be obtained with the 
sulphite vat. 
The following recipes from a practical American wool-dyer are 
added to this article with the hope that they may prove of value to 
some of the readers :— 
Recirrpes To DyE Woot Buack. 
(100 pounds clean Wool.) 
No. 1. 
Prepare with 
Blue Vitriol (CuSO,) .. : . IS pounds. 
Copperas (FeSO,) . . 3 pounds. 
Boil wool 13 hours, then take out of the tub and drain ; throw 
away this liquor. 
Color with 
Chip Fustic . : - - . 10 pounds. 
Chip Logwood : 15-35 pounds. 
The quantity of Log wood depends upon how intense a color is 
wanted. 
Boil chips in a bleeding bag 2 hours before putting in the wool; 
boil wool in this liquor 13 hours, turn off steam, and let the wool 
remain in the liquor until it cools—2 hours or longer; then drain 
off the liquor. 
No. 2. 
Prepare with 
Bichromate of Potash (K,Or,0O,) . 2 pounds. 
Boil wool 14 hours, then take it out of the tub to denin and throw 
away the liquor. 
Color with 
Chip Logwood : : . 15-80 pounds. 
The quantity depends upon how intense a shade is required. 
‘iy chips in bleeding bag 2 hours and treat wool as in recipe 
wo, tT. 
Where there is time, permit the wool to remain in the prepara- 
tion (in either recipe) 2 hours after it is boiled, and let the liquor 
cool before draining it off; the wool is of softer feeling than if 
pushed through quickly. 
