This picture shows Blue Form without the top copper pieces but I had the work like that for some time.
The white you see on top is from the porcelin clay mold I used. I baked the mold only to 1600 Farenheit so the clay was really brittle and open. The glass therefor got a better hold of it and pulled a skin of it with it when I took the top glass part out of its mold. I had also made marks into the clay mold so that help the glass to pick up the clay even better beside not having any kilnwash on the mold.