[Three Muses Glass]

Originally Posted by lunesse

Copper oxide makes pretty blue bubbles? tell me more! Where does one get copper oxide? Does it work in any COE of glass?

Here's a quick article. https://www.jewelry-making-how-to.co...s-bubbles.html

I saw some of the red copper oxide on etsy but pottery supply should have it. I don't know if it's OK with any COE. I probably tried it with 104. Not very good results and I didn't stick with it. Messy and finicky, even fusing with it.