Yadda za a tsaftace corundum crucible na narkakken gilashin?

Hanya mafi kyau ita ce dumi sannu a hankali. Gabaɗaya magana, kuna ɗaga zafin jiki zuwa kusan 200 kuma ku ajiye shi tsawon rabin sa’a sannan a hankali yana zafi. Idan zafin aikin ku yana a 1200, zaku iya ɗaga zafin jiki kai tsaye zuwa 1300 kuma ku jira ya faɗi baya zuwa 1200 a zahiri. Saka gilashin ba sauki karya ba!