304  Onthe Process of Bleaching with 
drop, till the oxygenated acid ceased to destroy 
any more colour. It destroyed the colour of 160 
grains of the acetite of indigo. 
EXPERIMENT II. 
A repetition of Experiment 1. The colour of 
165 grains of acetite of indigo was destroyed in 
this experiment. 
EXPERIMENT III. 
A repetition of Experiments 1. & 11. The 
colour of 160 grains of the acetite was destroyed. 
EXPERIMENT IV. 
To half an ounce of the oxygenated muriatic 
acid, were added 8 drops of pure potash ina liquid 
state. This quantity of alkali was about sufficient 
to deprive the acid of its noxious odour. This 
mixture destroyed the colour of 150 grains of the 
acetite of indigo. . 
EXPERIMENT V. 
A repetition of Experiment 1v. The colour of 
146 grains of the acetite was destroyed. 
errors, I therefore added to a solution of indigo in sul- 
phuric acid, after it had been diluted with water, acetite of 
lead, till the sulphuric acid was precipitated with the lead, 
The indigo remained dissolved inthe acetous acid, 
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