To render fabrics fireproof steep them (a) in a solution of sal-ammoniac and plaster-of-Paris. Other preparations are: (b) Borax 12 parts, Epsom salts 9 parts, dissolved in 80 parts of warm water, (c) Sal-ammoniac 2 parts, sulphate of zinc 1 part, water 15 to 20 parts. (d) Alum 1 part, phosphate of ammonia 1 part, water 20 parts. (e) Phosphate of ammonia 14 parts, sal-ammoniac 7 parts, water 80 parts, (f) Alum 6 parts, borax 2 parts, tungstate of soda 1 part, dextrine dissolved in soap-lye 1 part; the dextrine is for the purpose of causing the chemical salts to adhere to the substances being treated, (fir) Sulphate of ammonia 8 parts, carbonate of ammonia 2 1/2 parts, boracic acid 2 parts, borax 1 3/4 parts, starch 2 parts, water 100 parts.