Shellac resist on pottery…
Using shellac, or wax resist is a wonderful but time intensive way to create a relief pattern. I start this process using a piece of pottery that is fully dry. The first step is to draw a design on the porcelain, (porcelain works best because there is no sand or grog in it). Planning drawings and patterns involves thinking about both the positive and negative space. For this particular piece of pottery shown in the video below, I have created a grid, then an abstract leaf pattern. This pattern is ancient, and can be found everywhere from the tiles of Islam, to early American quilts. The positive and negative space on this grid leaf pattern creates an optical illusion. Some of my favorite images of this come from quilts.
Once I have penciled in the imagery I paint over it with wax resist. The wax will burn out in the kiln firing. Some potters use shellac, but I am not fond of the smell. After the wax or shellac is totally dry, (an hour or so), I begin to sponge off the clay around the imagery. This slowly takes away as much or as little clay that you want. I have to be careful at this point not to go through the clay where it is thin! When I want to get into the tiny detailed spots I use an old dental tool and carve away the wax, then wipe that area with the sponge. After a day or so I can then put it in the kiln for the first firing.
The next step is the glazing and the glaze firing. The photo below shows a few finished urns glazed in a clear glaze, which allows for the pure white porcelain to shine through. You can find these on LuciaUrns.com.