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Spectrum 500 Underglaze

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These underglaze pens have a frit base rather than a slip (clay) base for Spectrum's underglazes. The advantages to the user are that these underglazes can be applied on greenware or bisque and they can be used with or without a clear glaze covering. When used without a clear glaze cover they have a matte velvet like surface. However, when used without a clear glaze cover they are not considered dinnerware safe because the rough surface can be difficult to clean and can encourage bacteria growth.