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For drawing or marking on any clean, oil free, vitreous surface. Surface can be coated with light spray of hairspray or artistÃs adhesive prior to using crayons. Pre-enameled steel or copper can be slightly warmed prior to using crayons resulting in solid applications of crayon marks. Crayons are water soluble. Fire at 730-760ÃC for 2 minutes or until glossy. A cover coat of transparent enamel is desirable.