Range of Spectrum Low fire & high fire underglazes that are opaque with 3 coats, semi-opaque with 2 coats and semi-transparent with 1 coat. They are compatible with most clear glazes especially Spectrums; (806-230) Low Fire Glaze 450ml Clear (700), (806-368) Low fire glaze 450ml Satin Clear (250), (805-700) Stoneware glaze 450ml Transparent (1100),(805-728) Stoneware glaze 450ml Satin Clear (1120),(805-840) Stoneware glaze 450ml Clear Crackle (1187),(805-870) NSD Glaze 3.405kg Clear (1500),(805-872) NSD Glaze 3.405kg Clear Crackle (1501) and(805-874) NSD Glaze 3.405kg Satin Clear (1502)
These Underglazes are made using a frit base rather than a slip (clay) base, the advantage being they can be applied to greenware and bisque and used with or without a glaze covering. When used without a glaze cover they have a matte velvet like surface. However, when used without a clear glaze cover are not considered dinnerware safe because the rough surface can be difficult to clean. This range of inderglazes shows good temperature stability up to cone 6 and some can be fired to cone 10. when fired hotter than cone 04 you may get small colour variations from those shown on colour tiles.
Some of the underglazes will start to look glossy without any clear glaze cover at cone 5, these colours are:507 (english rose), 530 (hunter green), 537 (Cobalt blue), 538 (Blue velvet) and 544 (burgundy).
The underglazes can be intermixed to create your own colours. However we recommend that you do not mix561 (dark red), 562 (Bright red), 563 (bright orange), 567 (Fire engine red), 568 (christmas red) and 569 (Neon orange) with any other colours as they do not mix well.
Fires at cones 06- 6 (995ºC-1241ºC).(Colours shown are an indication only) (each tile shows colour un-glazed on upper left half, and covered by a clear gloss on lower right half)

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