Spectrum Underglaze Pens
Spectrum's 500 Underglaze Series is frit based. The advantages to the user are that these underglazes can be applied on greenware or bisque.
Lead Free, Non Toxic, Fire to Cone 06-6 (1000-1240 deg C)
A full palette of rich, vibrant colours that are opaque with 3 coats, semi-opaque with 2 coats and semi-transparent with 1 coat.They are compatible for use under most clear glazes.Can be applied on greenware or bisque and can be used with or without a clear glaze covering.Image shows the unglazed colour in the upper left half of the tile and the colour when covered by a clear gloss glaze in the lowerright half of the tile.These samples were fired at cone 05.Spectrum underglazes generally have good temperature stability up to cone 6 and for many colours to cone 10.Please note that when fired higher than cone 04 you may get small colour variations from those shown on the chart.