These are stain based underglaze brush on’s that hold their colour integrity over a wide range of temperatures from 1000oC to 1250oC.
Without a top transparent glaze they give a matt surface which we would not consider food safe . Bisque fire, clean away salts, apply UG, allow to dry, apply top glaze, glaze fire.
We do not recommend applying any make of underglaze is applied on to greenware unless you are 100% confident that the piece is fully dried out - moisture turning to steam can make the UG peel off during final fire.
