Dry writing board possessing anti-halation effect and process for producing the same

摘要

A dry writing board possessing an anti-halation effect which comprises a metallic plate having a ground coat fire-coated with a glaze comprising an acid component and a base component, the composition of the glaze being 30 to 45% of silicon oxide, 15 to 25% of titanium oxide, 5 to 10% of sodium oxide, 5 to 15% of potassium oxide, 1 to 5% of calcium oxide, 2 to 5% of aluminum oxide and 10 to 20% of boron trioxide, all percentages being by weight.