Could anyone tell me what the term flash,or flashed means when used describing Indiana Diamond Point Glass? Thanks in advance. Deb

I'm just taking a stab at an answer here. But, I think that it may refer to a sheet of glass that has another color layered on top of it. Some examples might be on the following link.

Flashed Indiana Diamond Point Glass - Google Image Search

How it is done, might be the way that is described on the following link.

Flashed Glasses

You are welcome, and I'm glad that you found what you needed!