More vocabulary words for the glass collector to keep in mind

When you start to collect items in a certain area like glassware, you find out that you need to know some of the terminology when you go along.  Here’s some of the words that I’ve heard over the years about glassware:

Bent (or Slumped) Glass—this is glass that has been heated up in a kiln from room temperature to a temperature high enough to cause it to soften and sag into or even over a mold. The finished product will take the shape of the mold that the glass is around.

Iridescent—this is a surface treatment when a layer of metallic oxide is bonded to the hot glass surface just after the form the glass into a sheet.  The result is a colorful one, and it also has a shimmering effect.

Seedy Glass—this is glass that has air bubbles trapped in it. This is when air or gas is injected into the molten glass prior to forming the sheet causing the bubbles.

What kind of terms have you heard or run across?

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