How to Liner-Glaze a Mug
Section: Glazes, Subsection: Food Safety
Description
A step-by-step process to put a liner glaze in a mug that meets in a perfect line with the outside glaze at the rim.
ArticleUsing a liner glaze on your functional ware is not only visually appealing but it is also a public declaration that you as an artist recognize your accountability for the safety of your ware. It takes extra effort to put a liner glaze in your mugs but its worth it One of the biggest challenges of using a liner glaze is getting the interior and exterior glazes to meet in a clean line. Making that line on the lip works well because the two glaze melts will flow away from each other rather than across the boundary. Following are some tips and a technique that you can use.
- Use glazes that are not too fluid or they will bleed into each other excessively at the join.
- Make sure the join occurs at the highest point on the lip, this will encourage both glaze melts to flow downward onto their own side rather than across the boundary.
- Use a sharp trimming tool or knife to trim the glaze to get a clean line (see below).
- Make sure your glaze slurry is well stirred and gels properly because you need to make shallow dips and if there is a layer of water on the top it won't work well.
- Use a pitcher to fill the bisque mug with liner glaze. Pour it out in a circular motion into the glaze bucket and then dip the lip into the glaze so it goes just barely over the rim and down the outside (perfecting this step will save you time in the next step). If the handle it high avoid dipping deep enough to touch it.
- Put the mug on the wheel and wax up the inside (starting about an inch down) and up around the top of the lip.
- Now you need to cut away the glaze (down to the bisque) starting on the outside and up around the lip to its highest point. I find that using a sharp knife in one hand and turning the mug with the other works well. I hold the blade at a 45 degree angle to take the glaze off at the dividing line first and then I clean up any remaining on the outside of the lip. If you can attach the mug to the wheel (i.e. Giffin grip) then you might find that you can trim the glaze off with greater precision using a sharp trimming tool. When done you should have a perfect edge of wax-covered glaze that stops at the center of the lip.
- Wet your hand (so it won't pull off sections of wax when you touch them) and first dip the lip about 1/2" into the colored glaze (hold the mug level). Immediately turn the mug over, put your wet hand inside, clamp against the interior surface, and jerk it downward lightly to encourage the
colored glaze on the rim to pull down a bit. Then push the mug into the colored glaze to overlap the lip dip just made. Pull it out and hold at an angle so drips fall off one spot.
- Sponge away any drips of dark glaze over the liner on the inside or the lip.
In Bound Links
Pictures
Celadon cone 10R glaze (about 3.5% iron oxide) with G1947U transparent liner glaze
An example of how a liner glaze can meet another glaze at the rim of a piece. This it quite simple to achieve.
An example of three cone 10R mugs that have a liner glaze.
The G2571A glaze is used as a liner and the base for the brown and blue glazes on these cone 10 reduction mugs.
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