At Winton Pottery glazes are added to pots when they are 'leather-hard'. This means that firing can be completed in one sequence, rather than the more normal two sequences, the first to render the clay to 'biscuit' form, sufficiently hardened to take the glaze, and then re-fired after glazing. The 'raw-glazing technique used here requires that clay body and glaze be carefully matched in design so as to avoid disasters in the firing. Here Marg is adding 'slip' coating to mugs which will then be decorated before receiving a transparent glaze by a similar process.