Momwe mungayeretsere crucible ya porcelain?

Mutha kuyesa ndi chromic acid lotion. Njira yochapira mafuta odzola a Chromic: chromic acid lotion (100g potaziyamu dichromate wosungunuka mu 200ml concentrated sulfuric acid), samalani zachitetezo pokonzekera, samalirani, ndipo kumbukirani kukumbukira.