| 摘要 |
A liquid dye composition comprising an organic solvent-soluble premetallized azo dyestuff in a volatile organic solvent medium, said composition further containing a finely divided silica thickening agent and/or xylol, toluol, perchlorethylene or mineral spirits or any mixture thereof. A process for coloring a porous substrate, preferably stone, comprising applying thereto a liquid dye composition comprising an organic solvent-soluble premetallized azo dyestuff in a volatile organic solvent medium, said composition being preferably as described above, and allowing the composition to penetrate the substrate, preferably followed by treating the penetrated substrate with an aqueous solution of a copper salt or a polymerizable organic siliconate, and then removing any excess unpenetrated composition from the substrate.
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