My glass cracked in the microwave during the firing process

My glass pieces are still cracking even though I am slowing down the firing schedule.

So what do I do with my cracked pieces of glass?

I have been told that the glass must be clean before fired.

What do I used to clean it?

Why do my fully fired glass pieces come out in a different shape to what I wanted?

My glass spread out too far in the kiln and stuck to the sides, ruining my kiln.

Why did it do that?

Why do my glass pieces have bubbles in them?

My fired glass piece is full of bubbles!

What can I do to stop this from happening next time?

A black charred spot has occurred in my fired glass piece.

Why?

My glass pendant broke after wearing it for a while.

Why?

I used clear glass and when I had fully fired it, it turned bright orange and stayed that color.

Why?

My fired glass appears to have a whitish dull scum on it, almost like crazing.

What caused this?

When I fire either dichroic or iridescent glass it has an “outline” around it.

Why is this?

My fused glass piece has sharp spikes.

Why is this?

How do I stop my pieces of glass moving when placing my design inside the microwave?

I have lots of left-over glass.

Can I use this for other firing projects?

I have clear dichroic glass – how can I tell which side the dichroic coating is on?