Bullseye Copper Foil is fantastic for adding decorative elements to the surface or interior of your fused works. As Copper will react with a number of glasses, it's important to avoid contamination by keeping copper from touching the kiln shelf, better still, use a separate shelf for fusing with metals.

Can be cut with scissors and placed between layers of glass.
It will change colour if exposed to oxygen whilst firing and a variety of results can be achieved.
Also available, Gold or Silver Foils in 100 gauge.
25.4 microns thick

Copper foil fish and copper wire are used in this fused glass piece:

Copper foil and copper wire as inclusions in fused glass