Description
This section is from the American
Hand Book of the Daguerreotype, by Samuel
D. Humphrey. Published S. D. Humphrey, 37 Lispenard Street 1858.
22. Rotten Stone
"Purchase the best ground rotten stone
of the druggist, put a few ounces at a time in a wedgewood
or porcelain mortar, with plenty of clean rain water.
This should have about forty drops of nitric acid to the quart.
Grind well, and after letting the mortar stand two minutes,
pour into a third. After remaining undisturbed eight minutes,
finally pour off into a fourth to settle. Rinse back the sediment
in the second and third, and grind over with a new batch.
Repeat the operation till you have all in the fourth vessel.
Let this stand several hours, and pour off the water very carefully.
Set the deposit in the sun, or by a stove to dry.
When perfectly dry, pulverize, and it is ready for use.
With a little trouble you will obtain in this way a much
better article than can generally be bought of dealers.
For the last washing, alcohol, or a mixture of alcohol
and water, is preferable."
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