A ceramic enamel composition applied to glass in a pattern or continuous area and fused or otherwise processed during manufacture to create a durable decorative or opaque coating.
GlassRenu · Educational illustration
Meaning and boundaries
Ceramic frit is not ordinary paint, contamination, a removable film, or a pyrolytic or vacuum-deposited functional coating.
Why it matters in glass restoration
Abrasive treatment on the fritted surface can permanently change pattern, color, thickness, gloss, coverage, and product acceptance.