So here is the mug after the first firing. It is still warm from the kiln. Note the change of colour from the grey of the unfired clay to white, which is pretty close to how it will be once it is glazed. The glaze firing will warm the colour slightly and deepen the blue of the interior.
Next the mug needs to be sanded to remove any rough spots, especially around the foot and rim. I use wet and dry sanding pads which are flexible so make it easy to follow the contours of the piece.
Then the mug is washed thoroughly. Some potters prefer to use a damp sponge or skip this step entirely, and just give each pot a quick brush before glazing. Biscuit firing produces a large amount of dust, and the sgraffito process exacerbates this. I have found if I don’t wash my pieces I have real problems with my glaze not adhering properly.
This is the final stage for today… waxing. Again there are many different approaches to the glazing stages, many potters prefer not to wax and just wipe any excess glaze from the foot of their pieces. It is imperative that no glaze comes in contact with a kiln shelf as they will cement together, damaging both the pot and the shelf. I prefer to apply wax resist to any areas where I do not require glaze. The glaze does not adhere to the waxed areas and the wax burns off in the firing leaving a crisp line where the glaze finishes. If any wax goes in the wrong place the pot will need to be biscuit fired again to remove it before glazing.
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