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Letter Codes
Sheets are assigned one of four grades at the Bullseye Factory. They
are:
F: often called "Fusible," a glass that has passed factory testing for
color and compatibility in kilnwork. Also called "Tested Compatible" or
"Bullseye Compatible." Recommended for kilnwork, flamework, stained
glass or mosaic use.
P: first-quality nonfusable glasses are called "Standard." Not
recommended for kilnwork but good for stained glass or mosaic use.
B: Fusible-curious glasses. Compatible, but fired color or appearance
falls outside of target range. Sometimes called "Furious." Discounted.
Recommended for kilnwork, flamework, stained glass or mosaic.
C: nonfusable, nonstandard glasses are graded and marked "Curious."
These may not fall within the accepted color range or may have minor
flaws. Discounted. Not recommended for kilnwork, but good for stained
glass or mosaic use.
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