As part of the Making Histories project / exhibition at Leamington Spa Art Gallery and Museum, I have collected clays from various parts of Warwickshire, both for use clay bodies for throwing (forms inspired by Roman Mortaria), and for glaze making. By good fortune – the Mercian Mudstone clays I was given permission to dig up near Mancetter in North Warwickshire created a beautiful blue / grey creamy chun glaze at earthenware temperatures – when combined with calcium borate frit (following a classic Emmanuel Cooper glaze recipe – 35% clay with 65% CBF… I did try other percentages – but this one works best!).