I like to experiment.  (You get to do that when you have your own kiln!)

In my latest experiment I used some copper wire. I had a spool of grounding wire, the kind you use to ground electrical outlets in your house. I looked up the melting point of copper and found that it was lower than cone 10 temperatures so I wondered, "What if you just wrap some wire around a pot and then cover it with clear cone 10 glaze?"

I tried it. Not a good idea!

The copper not only melted but it spattered everywhere in the kiln. Where large pieces fell on the kiln shelf, it burnt craters into the shelf.

One of the pots in the firing did come out with a pleasing results. It was a Santa Barbara (plain white) clay bowl with clear glaze on it. The splattered copper made small black to brown speckles on the bowl.