铅颜料
The original white lead pigments have oxidized and turned black.
最初的白色铅质颜料氧化后变成了黑色。
It is found that hematite and malachite are more stable to both light and moisture than lead pigments, especially red lead, which can change into white lead at high humidity ( RH from 66% to 81%) with ultraviolet ray.
铅颜料容易变化,尤其是铅丹在光照高湿(相对湿度66%~81%)条件下变成铅白。
It's a long-oil alkyd-based primer with red lead pigments.
含红丹颜料的长油醇酸底漆.
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