Improvements relating to the Treatment of Silk with Thiourea, its, Salts, or its Substitution Derivatives

摘要

25,752. Lake, H. H. (Soc. Anon. Co-operativa per la Stagionatura E. L'Assaggio delle Sete ed Affini). Dec. 11. Size.-Silk that has been weighed with tin salts is treated with thiourea, or one of its salts or substitution derivatives, to prevent alteration or staining due to light, heat, the atmosphere, perspiration, or substances, containing chlorides. Specification No. 25,728, A.D. 1904, is referred to.