9 Apr 10

Glazing ceramics basics

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.

hand thrown mugs white glazed ceramic mugs blue pottery mugs

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.

Also my small sugar bowl was featured on the shapes and memories blog in an etsy parade. Lazygiraffe took some photographs of her earrings with one of my sake flask cups

2 comments

  1. Deepa says:

    hello! I’m having such fun taking jewellery pictures with your cups, they are the perfect size for earrings!

    Are your new mugs going to be on sale in your etsy or folksy shop?

    • Victoria says:

      Hey, the new mugs will first be available on Etsy and then they’ll migrate over to Folksy. Thats generally how I update my shops.

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