We can use arsenic alkali residue to produce glass precipitation agent, turning harm to good. It can be applied widely in industry and bring good society benefit.
可用砷碱渣制备玻璃沉清剂，变害为利，工业实践性强，有较好的社会效益。
2
This is absolutely official. The old glass of the Noctilux was classes better, containing arsenic, lead etc. all now.
这绝对是官方的，旧版的镜片更好，包含砷，铅等物质。现在。
3
The use of arsenic-free refining agent in C-glass batch and the corresponding adjustment of relative raw materials are introduced.