[Steven]

I am pretty new and have a premix torch with propane and oxygen (I already had this torch and will get a surface mix when I can afford it).

Anyway, all was well with the COE 104 glass I bought off ebay, etc. I used both transparent and some opaque with no problems with color whatsoever.

However, I ordered some white and yellow Devardi glass. My torch discolors it. At best, it makes the white turn to a very off white. At worst, it turns the yellow to a dull, ugly blue and the white to very dark grey.

I have tried adjusting my flame every which way. I've tried very low heat and higher heat. Also, I've tried using the flame near the tip and further out. Some adjustments work better than others. It seems like the adjustments on lower heat and with some orange in the flame (lower oxygen) work best, but none produce unchanged color in the yellow and white beads.

Am I still doing something wrong or is it impossible to make a premix torch work with Devardi glass? Should I just forget using the Devardi glass until I get a surface mix torch?