Optimum color brilliance can be expected under oxidation firing conditions between Cone 06 and Cone 1. Many of them will go higher, up to Cone 10. Underglaze colors are more brilliant when used with a lead-bearing covering glaze and more subdued with a leadless glaze. Fired underglazes may also be used for a decorative matte surface without a protective covering glaze. Underglaze Decoration - Instructions on how to paint with ceramic underglazes .
Photographic reproductions differ from actual colors.
Firing conditions and results vary. Test fire all glazes in your kiln and your firing environment before using them in production.