166 TRANSACTIONS OF THE [jUNE 6, 



Xo. 2. 



Cochineal 8.0-15.0 gms. 



Cochineal scarlet.— 'No. 2 (10054, 10055). 



First method: Mordant 1-1^- hours with 0.6 gm. SnCl.^ cryst., 

 0.4 Tartar; wash, and dye in 1.2 gms. Cochineal 1-1^ hours; enter 

 wool in mordanting and dye-baths at 50° C. and raise gradually to 

 boiling. 



No. 3 (10056). 



Second method : Bath ^ full of water 



Oxalic Acid 0.8 gm. 



SnCl, . . . . . . 0.6 " 



Ground Cochineal. . . . .1.2 gms. 



Boil for 5-10 minutes; then fill bath with cold water, introduce 

 wool, heat to boiling-point (|-1 hour), and boil ^ hour. Bath not 

 exhausted in this method. 



Deficiency of tin causes dull bluish-red ; an excess makes the 

 scarlet paler. 



Lac. 



Dye 



SuCl, 



HCl 



Oxalic Acid 



Boil 1^ hours. Add the HCl to the dye and allow to stand over 

 night. 



Chromium. 



K^Cr^O, ...... 0.3 gm. 



Same amount of Lac as above. Mordant ; wash, and dye in 

 separate bath 1^ hours. 



Alumina. 



A1,(S0,) 0.4 gm. 



Tartar 0.5 " 



Mordant; wash, and dye. 



Copper. 



CuSO, 1.0 gm. 



Iron. 



Tartar 2.0 gms. 



FeSO, 0.8 gm. 



