1.1 This specification covers two types of pigment commercially known as basic lead silicochromate. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for informati This specification covers two types of pigment commercially known as basic lead silicochromate. Both types of pigment shall consist of silica coated with lead licates and lead chromates with mass color and character, and oil absorption equal to that of