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...ive driers. Some pigments also act as driers, such as [[lead oxide]] and [[manganese oxide]]. In recent years nonmetallic driers, such as orthophenathroline, ar

...t some of the additives are weakly bound to the polymeric matrix which can lead to separation and/or degradation. The combination of these factors means th | Formerly derivatives of [[lead]], [[tin]] and [[cadmium]] were used. Alternatives are barium/zinc mixtures