| Description |
35 leaves, 18 plates : illustrations ; 28 cm |
| Summary |
"On account of the high price of the old Dutch process of making white lead and the undesirability of sublimed white-lead as the bulk of the pigment, the use of zinc-white as an adulterant of the lead-white made by the old Dutch process is new extensively used by all paint manufacturers. The advantages of its use in conjunction with white-lead in the manufacture of white paints is the fact that it does not combine with sulphur as does white-lead itself. The specifications of the U.S. Light-house Dept. require 75% of zinc-oxide and 25% of white lead as a mixture. Over 75% of the zinc-oxide manufactured is used in the compounding of rubber goods. The zinc-oxide mixes well with other pigments, especially with white-lead. The zinc-white made from the ore is more durable and is considerably cheaper than that made from spelter. The zinc-white gives a much purer and a more decided white than lead-white. The absorbent properties of the zinc-white paint are considerably less than that of the pure lead-white paint. The property of flexibility in zinc-white paint gives it quite a demand for use in the manufacture of oil cloth"--Leaf 1. |
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