A Blog about Ceramic Art and Science

Ceramic Glazes

How Well Are You Mixing Your Glazes?

How Well Are You Mixing Your Glazes?

Glaze results on the thin side? As a studio technician at a busy pottery studio, it’s my job to mix and maintain 20 different studio glazes. I’m also the one studio users often go to for help when their glazes don’t work out as they had hoped. Every now and then...

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Why I Don’t Use a Hydrometer to Measure Specific Gravity

Why I Don’t Use a Hydrometer to Measure Specific Gravity

Adding Water to Glazes I didn’t always know about measuring specific gravity. Of the 10 years that I’ve been mixing glazes, I’ve only been measuring specific gravity for 3 of them. It wasn’t a technique I learned in school. But… I had heard about it enough times that...

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How to Measure the Specific Gravity of Your Glazes

How to Measure the Specific Gravity of Your Glazes

Video Tutorial In this video I demonstrate how to measure the specific gravity of a glaze I just mixed using a graduated cylinder and a scale. Measuring specific gravity is a way to calculate the water content of a glaze to ensure that each time you glaze, you have...

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How to Turn a Matte Glaze Glossy with One Ingredient

How to Turn a Matte Glaze Glossy with One Ingredient

A simple way to turn your matte glaze glossy Do you have a matte glaze that you wish was a bit glossier, or would you like a glossy version of one of your matte glazes? It's really easy to convert a matte glaze to a glossy glaze, just by adding one ingredient - Silica...

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How to Convert Kaolin to Calcined Kaolin

How to Convert Kaolin to Calcined Kaolin

If you have too much clay in a glaze recipe, you might have issues with your glaze crawling during the firing. Crawling is where the glaze pulls away from the clay body due to a combination of shrinkage, poor adhesion and high surface tension.

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Studio Tips

How to Convert Kaolin to Calcined Kaolin

How to Convert Kaolin to Calcined Kaolin

If you have too much clay in a glaze recipe, you might have issues with your glaze crawling during the firing. Crawling is where the glaze pulls away from the clay body due to a combination of shrinkage, poor adhesion and high surface tension.

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Don’t Skimp on Safety in the Glaze Lab

Don’t Skimp on Safety in the Glaze Lab

Most of our glaze materials come to us in their very basic, unprocessed form.  They are dug out of the ground, impurities may or may not be removed, they are ground into a fine powder, bagged and shipped to our suppliers. Working with these minerals in their raw state poses some health risks.

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Specific Gravity

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