Sodium Sulfide chuah ning
Carbon Tlawmternak Lam: Sodium sulfate cu anthracite lungmeihol asiloah a aiawhtu thilri hmangin a cawh i a zorter. Hi thil kalning cu a ttha tein dirhmi a si, thilri le riantuannak sawhsawh he, cun a man a fawimi, fawi tein hmuh khawhmi thilri hna kha a hman.

A ttha ngaimi a sen/a senmi sodium sulfide hnah, a kalning chung vialte ah fek tein ukmi chuahmi, a ttha ngaimi batch pakhat ah a ttha, cun tampi in pek khawh a si.