The coloured glaze is then applied and the piece is put back in the kiln for a second firing at 1,250 degrees celcius. This gives it its shiny appearance and makes it strong and firm. Making ceramics, or pottery, is one of the most ancient crafts in the world.It required great care and concentration and skill. Unlike paint, the coloured glaze is transparent and will not hide any faults in the making. Each piece is unique, with its own distinct characteristics.