I was fusing murini glass and system 96 earrings squares. Some of them were incompatible. I ordered compatible with 96. Any ideas what happened? The ones I fused on white or a color were fine, only the clear glass backgrounds left the halo crack. I am using a mix of assorted murini flower pieces ordered from Delphi.
Compatibility of glass is paramount in fusing. Who is the manufacturer of the murinni? is it cerified system 96? was your clear glass System 96? Are you absolutely sure there are not incompatibility fractures on the opalescent ones too?
Essentially, you need to give a lot more information on the products, the firing, the equipment, etc, to enable us to give answers that are likely to be helpful.