So those mugs I talked about the other day which were getting ready for their biscuit firing in the kiln. Well they’ve been fired and the next stage is glazing.
I’m going to pretend that you know literally nothing about ceramics when talking about glazes.
When a pot is biscuit fired in the kiln it means that it becomes heated to 1000 degrees. This removes all the water from the body of the pot making it very porous.
The glazes themselves are a variety of powdered chemicals, these chemicals perform chemical reactions within the kiln under intense heat to form the different colours.
The colours are formed from the different types of chemical or metal. so cobalt is blue, yellow sulpher and white tin. A glaze is actually a glass since the base material for every glaze is sand.
The powder chemicals are suspended in water, ideally the distribution should be even otherwise you’ll end up with an uneven glaze. It can appear streaked and uneven in thickness which is generally something you don’t want on a pot.
As you dip the porous pot water gets attracted to it. Since the glaze is in suspension it also draws the powdered glaze onto it, what your left with is a glazed pot.
You also have to leave a gap at the bottom of each piece. This allows a gap for the glaze to run and so it doesn’t stick to the kiln shelf when its being fired.