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Reminiscences
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water, and pour it steadily into the solution of tin as above prepared, stirring all the while. Let it settle twenty-four to thirty hours; pour off the water, leave the settlings, pour in two thirds of a quart of water. Stir it thoroughly; let it settle thirty hours; pour off as before, and filter the precipitate through filtering paper. The result is the purple of Crassus. The ounce of gold thus prepared must be well incorporated with the following batch: say thirty-two pounds of fine silex, thirty-six pounds oxide of lead, sixteen pounds refined nitre; melt the same in a clean pot, one little used, and smooth inside; when filled in, put the stopper to the pot loose, leaving it slightly open; leave it five or six hours, or time to settle, then a back stopper can be put up. In the usual time it will be ready to be worked out in solid, egg-shaped balls, and exposed to the air to be partially cooled; they are then to be placed in the leer under a strong fire, which will in two or three hours turn them to a red color; then the pans may be drawn slowly to anneal the balls.
    It is well known to mixers that colored glass is derived from metal oxides. To obtain the proper color depends on the purity and strength of the metallic oxides. The following receipts have with success been used:--


ALABASTER.
To 500 lbs. of batch add
30 " phosphate of soda,
10 " allumine,-- i.e. calcined alum,
3 " calcined magnesia.

BLACK.
To 1400 lbs. of batch add
180 " manganese,
100 " calcined iron scales, made fine,
20 " powdered charcoal,
10 " arsenic.