7). Green with Quercitron for Cotton. First, the cotton is dyed a sky blue colour by means of indigo dissolved by potash and orpiment; then it is passed through a strong decoction of sumach, in which it is left until well cooled. It is then dried, passed through the mordant of acetate of alumina, dried again, washed, worked for 2 hours in tepid bath of Quercitron, (26¼ lbs. to 110 lbs. cotton).
8). Green with Indigo Extract & Weld for Wool. Mordant 1 lb. wool with 4 oz. alum and ½ oz. cream of tartar. Dye blue with sufficient quantity of Indigo Extract. Wash and dry. Prepare a dye bath with weld which has been previously chopped up and boiled. Enter wool and boil for half-an-hour or more.
APPENDIX
Lichens used for dyeing wool brown.
Continued from [page 62]
S. scrobiculata. Aik-raw, Oak rag. Found on trees in Scotland and England.
Gyrophora deusta. Scorched looking gyrophora. Found on rocks in Scandinavia. Linnæus states that it furnishes a paint called "Tousch," much used in Sweden.
G. cylindrica. Cylindrical gyrophora. On rocks in Iceland. Greenish brown. Also G. deusta.