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DMCosta

Glaze Making Issue

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Bare with me, I'm relatively new at glaze making...

 

I recently made 250g of a yellow-brown glaze, a grey-brown glaze, and a transparent. All low fire cone 04, all with the same base ingredients. They all fired very gritty and rough feeling, and lack any shine or 'glass like' look. The kiln fired properly I got the recipes from a reputable glaze book. I wanted to tweak the recipe to get them more shiny but what can I do? Will adding more silica/flint help? If so how much more to a 250g sample?

 

Thanks for your help

~Dianna

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The glaze might not have fluxed, or it may have a lot of un-dissolved material left in it which would also cause roughness.

 

For small batches of test glaze, I sieve the finished glaze through a standard 10 cup coffee filter basket. I use a 1 inch paint brush and swirl it around inside the filter basket to help force the glaze through the fine mesh. This way even the most stubborn lumps get blended in.  Any crud in the raw materials gets left in the basket.

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You can also buy a Talisman test sieve, it's small, comes in different mesh sizes and fits inside a small plastic container from the paint aisle. You can use a rib or a brush to work it through. I bought mine for making small batches of colored slip up so I can mix the mason stain in evenly but now that I am starting to test glazes find they work for that too. I don't have a stick blender yet will have to see if I can find a cheap one but until then the sieve seems to be working.

 

Terry

clay lover likes this

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Thank you everyone for the advice, I did indeed sieve the glaze, I always do. Still perplexed about it, I may just ditch that recipe all together and move forward with something different. 

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