补充一下：
印刷过程中的钙来源 sources
1、油墨(钙盐,但非碳酸钙) ink (calcium salts, but not the carbonate)
品红色颜料 magenta pigment
一部分黄墨 also some in yellow ink
2、水(部分国内城市) water (but very little in most parts of China)
3、纸张 paper
填充剂 filler
12 - 25+ 百分点 percent
涂料 coating
常见70-80百分点 typically 70 - 80 percent
碳酸钙 calcium carbonate
来自大理石或石灰岩 from marble or limestone e.g. Carrara, Italy; and Malaysia
沉淀 precipitated