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URL: AMACO Velvet Underglazes, a traditional non-melting product meant for use under a transparent overglaze.
Click the link below to go to this page
https://www.amaco.com/t/glazes-and-underglazes/underglaze/velvet-underglaze/velvet-underglazes
Velvet underglazes fire true-to-color from cone 05/06 to Cone 6 (some till cone 10). Their name comes from the surface quality when fired to cone 6. The formulations have a high percentage of stain and are thus saturated, this enables good coverage even if applied thinnly. This product line has a good reputation for consistency, documentation and flexibility.
Related Information
Make AMACO velvet underglazes work better at cone 04
Amaco Velvet underglazes fire to a pleasant velvet surface at cone 6 achieving good opacity and coverage. However, at cone 04 the surface is dry. Could the velvet appearance be achieved there? These cone 05 bisque fired Buffstone tiles have a single coat of V-308 Radiant Red topped by a single layer of G1916QL1 clear brushing. Spectrum 700 transparent low-fire glaze has been liquid volume blended at a 9:1, 8:1 and 7:1 (V-308:S700). Notice that as more glaze is added the color actually darkens! By 7:1 the surface is velvety. 8:1 seems optimal (because 7:1 is losing opacity). But caution is needed because the higher the glaze percentage the greater the fired shrinkage misfit between underglaze and body (misfit is not tolerated as well at low temperatures because the bond with body is not as intimate). So a conservative mix 9:1 would be a better starting point. A side-effect is that adding the glaze may change the underglaze’s rheology (so a deflocculant or gelling agent might be needed to establish thixotropy).
Links
| URLs |
https://www.maycocolors.com/color/fired/fundamentals-underglazes/
Mayco Fundamentals traditional underglaze product (not melting). Wide range of intense colors. Transparent overglaze needed. |
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