I never understood from Oscar's articles that the crucible should be nearly airtight. Did I miss something? It was my understanding that the increasing heat would drive out any oxygen that is within the crucible, and that a loose fitting top was necessary for this to happen. I have seen some beautiful colors produced with the oven and crucible I now own, and it isn't even close to having a tight fitting lid. ????????

SRH

May God bless America and those who defend her.