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Spectrum High Fire Glazes
Stoneware Glazes Cone 4/6 - SP1100 to Sp1196
All of these glazes, except 1189 and 1190, are lead-free and dinnerware safe.
Most of them also come with the A/P non-toxic rating from the Art & Creative
Materials Institute (ACMI) which is clearly marked on the product label.
Some of the reactive type glazes are rated C/L by the ACMI which means that
they are considered toxic in the liquid (unfired) state due to the presence
of heavy metals, such as copper, beyond the non-toxic legal limit. C/L rated
glazes are not suitable for use by young children or pregnant women.
There are 3 types of Spectrum stoneware glazes: clear glazes; plain colored glazes;
and reactive glazes. In general, clear glazes are used to cover designs created with
underglazes. There is a choice of gloss, satin or crackle finishes. Spectrum's plain
colored glazes are opaque and come in gloss and satin finishes. Some of their most popular
stoneware glazes are the reactive colors which produce multi-tone and multi-colored effects
by the combination of various metal oxides. Many other interesting effects can be created
by layering these reactive glazes. In particular, layering a more fluid glaze, such as 1173,
underneath or on top of one of the other reactive glazes often produces beautiful results.
High Temperature Cone 9/10 Glazes - SP1200 to SP1275
North State Street, Elgin, Illinois 60123
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