Linda Bloomfield is a scientist turned potter. More glaze recipes can be found in her books, Colour in Glazes (A&C Black 2012), The Handbook of Glaze Recipes (Bloomsbury 2014), Science for Potters (The American Ceramic Society 2017) and Special Effect Glazes (Herbert Press, 2020).
Red has always been a difficult colour to obtain in ceramics. There are several ways to make red using colouring oxides such as iron, copper or chromium and tin, but they seldom make a true, bright red. The easiest way to get a really bright red is by using commercial stains. Red stains are made using cadmium sulphide and cadmium selenide. They are mixed with zirconium silicate and fired, then ground into a powder. Red stains used to burn out at stoneware firing temperatures, however, there…
