First let's understand what Glass Fusing is. This warm glass procedure is the method of taking two or more pieces of glass and heating them together in a kiln.
The glass can be taken up and the pieces will mold together. This is called a "Full". If taken to a lower temperature but still heated until the pieces adhere to each other is called a "Tack".
This heating of the glass causes it to become soft and if heated to a higher temperature, it becomes molten and pliable. As it becomes molten, the two or more pieces start to sink together and become one piece of glass. The heated pieces of glass must be compatible for them to melt together into an everlasting unified unit.
Full vs Tack
What is the difference between a full and a tack?
When glass is taken to the point where it totally melts together into one single unit then it is considered to be a "Full". This hot process usually occurs around 1450 to 1550 Fahrenheit, depending on your individual kiln.
A tack is when two or more pieces of glass are heated until the pieces start to melt together. They almost appear to be just glued together. Each piece will maintain its original shape and texture. This process usually occurs around 1350 to 1450 Fahrenheit.
Two problems can occur when you are attempting either of these procedures. You can lose the shape of your glass, and you can get unwanted
Most glass when heated wants to assume a thickness of about ¼ inch, or about two layers of glass thickness. If you are trying to heat just one layer of glass, it has a tendency to pull in to obtain this ¼ inch thickness. Two or more layers will flow out and assume the ¼ inch thickness, which is about the size of two layers of glass.
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