To Make Extract Of Indigo
1 lb. oil of vitriol (pure, not commercial).
2 oz. finely ground Indigo.
1/2 oz. precipitated chalk.
Mix a little of the indigo with a small quantity of oil of vitriol,
add a little chalk and stir well. Go on mixing gradually till all is
used up. This should take an hour or two. Stir a few times each day
for 4 or 5 days, adding about 1/2 oz. more of chalk by degrees. It is
best mixed in a glass stoppered bottle or jar, and stirred with a
glass rod. It must be kept from the air.
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