An Improved Process for Coloring and Hardening Natural Stone, also applicable to Organic Materials such as Ivory or the like.

摘要

5594. Lake, H. H., [Chemische - Technische Fabrik, Dr, A. R. W. Brand & Co.]. March 10. Dyeing organic substances. Stone, or organic material, such as ivory, is impregnated throughout its substance with colouring or hardening solutions by first freeing it from moisture at a gentle heat in a vacuum, then transferring it to a vacuum chamber filled with the solution, and afterwards admitting air at atmospheric or a higher pressure to the chamber. The stone or material is afterwards dried by evaporation in a vacuum, and may be impregnated with two or more solutions in succession in order to produce coloured precipitations or chemical combinations in the material. One or more of the following substances may be used, viz., fuchsine dissolved in water or alcohol, coal tar, dyes, carmine, copper acetate, sulphate, chloride, or ammoniacal salts, potassium ferrocyanide, potassium ferro- and ferri-cyanide compounds, ferric salts, alkaline salts or compounds of phosphoric, chromic, arsenic, arsenious, cyanic, and antimonic acids and all ammoniacal metal salts, with the exception of sulphates and oxalates which form insoluble compounds with calcium.