It has reference value for the comprehensive utilization and deep processing ...

The polymerizing ferric sulfate can be produced by oxidizing copperas which is the by product of titanium dioxide and adding polymerizer.

When in use, the raw materials are only needed to be crushed and mixed with water, and then can be applied to an affected part.

After completion of laconic epistolary compositions she abandoned the implement of calligraphy in the encaustic pigment, exposed to the corrosive action of copperas , green vitriol and nutgall.