ironing board cover 97cm x 33cm_washing machine semi automatic cover

Lithopone, I may state, is a mixture of zinc sulfid and barium sulfate which has lately been placed upon the market as a very desirable material for use in the manufacture of paints or as a substitute for white lead. The standard grade of this product contains 29.4 per cent. of zinc sulfid, which, as will be seen, is a molecular mixture of the two ingredients named.