Important: Safety Warning
This page describes practices involving highly flammable materials in ways that create a serious risk of fire or explosion.
In addition, this page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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Le Blond's Varnish
Keep 4 nish-this filtered solution has to be precipitapounds balsam of copaiba warm in a sand or ted with diluted sulphuric acid (1 part acid to water bath, and add 16 ounces copal (previ- 20 parts water), the precipitate collected on a ously fused and coarsely powdered), by single coarse muslin cloth, and washed out with cold ounces, daily, and stir it frequently. When clear water till it runs through without taste. dissolved add a little Chio turpentine. (Sce No. 24.) Then fill a stone or wooden ves- 2927. De Sylvestre's Dextrine Var- sel with boiling water, and throw the precipinish. Dextrine, 2 parts; water, 6 parts: tate in it; it will directly soften and stick torectified spirit, 1 part. (See No. 2924.) gether; this half mass has to be kneaded in the