2) Daim ntawv cog lus tsis pub lwm tus paub tuaj yeem kos npe
3) Xya hnub rov qab lav
Tseem ceeb tshaj: peb tuaj yeem muab tsis tau tsuas yog cov khoom lag luam, tab sis kev pabcuam kev daws teeb meem!
| Yam khoom | TSEEM CEEB |
| Assay (CuO) | 99% min |
| Fe | 0.2% max |
| Cd | 0.005% max |
| Chlorhydricacid indissolvableness | 0.2% max |
| Cov dej Soluble | 0.1% max |
| Chloride (Cl-) | 0.2% max |
| SO4 | 0.2% max |
| Pb | 0.02% max |
| Hg | 0.005% max |
| Hom | Epoch-Chem |