Underglaze

Underglaze is a specialized ceramic material used to create designs and patterns on pottery before a transparent glaze is applied. Unlike traditional glazes, underglazes are formulated to stay precisely where they are painted and do not run or melt during the firing process, making them essential for detailed artistic work. They are commonly available in liquid, pencil, or chalk forms.

Several prominent brands dominate the international market, including Amaco (American Art Clay Co), Speedball, and Mayco. Each of these companies maintains separate manufacturing facilities, primarily located in the United States, but also distributed globally through specialized art supply networks. Ownership typically remains with established industrial arts corporations that specialize in chemical formulations for hobbyist and professional potters.

While the brand origin for most leading underglaze products is the United States, the ultimate ownership varies. For instance, brands like Amaco remain privately held, while others may be part of larger craft conglomerates. The products are distributed worldwide to facilitate professional ceramic production and educational art programs.