| 摘要 |
PROBLEM TO BE SOLVED: To provide a transparent coloring agent for glass having excellent heat resistance which can easily color glass surface and to provide colored glass. SOLUTION: The transparent coloring agent for glass is prepared by blending sodium silicate, lithium silicate, water, surfactant, and further, inorganic pigment or metal colloid solution (at least one kind selected from aqueous gold colloid solution and aqueous silver colloid solution). The weight ratio of sodium silicate to lithium silicate in the coloring agent ranges from 8/2 to 2/8. The coloring agent for glass is applied on a glass substrate by a method of spraying, dip coating or the like, dried to remove the solvent, baked in a furnace at 100 to 700 deg.C for 10 to 50 minutes and cooled to obtain colored glass.
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