Instead of using refined glaze materials bought from a supplier, it is possible to make glazes using locally found materials such as clays, rocks, shells and wood ash. Four main types of material are needed to make a glaze: clay, feldspar, calcium and silica.
Clay
Locally dug clays or slips can be used as decorating slips and glazes. These may contain iron oxide and titanium dioxide as impurities, which will give colour and texture to the glaze. Clays can be recycled
