The pumice comes from Italy; and the pigment which gives "the plug" its color is cadmium sulfide.
浮石产自意大利，给“塞子”上色的颜料则是硫化铬。
2
Cadmium ion mainly comes from industrial waste water discharged by electroplating, battery, alloy manufacturing, pigment, mining and refining process.
镉离子主要来源于电镀、电池、合金制造、颜料、采矿与选矿行业排放的工业废水。
3
As a substitute of cadmium red and chrome red, is a match environment red pigment. Used in thermoplastic resin, thermosetting resin, alkyd resin, rubber, other polymer and cement, coating.