Glaze Making Issue
Posted 16 July 2014 - 08:22 PM
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
Posted 16 July 2014 - 10:29 PM
.or it could require a soaking at the maturing temperature during the firing.
Posted 17 July 2014 - 10:30 AM
They all fired very gritty and rough feeling,
Did you sieve the glazes?
Posted 17 July 2014 - 10:53 AM
For batches that small, sieving can be difficult. A stick blender works really well for smoothing out small batches.
Kiln Repair Tech
L&L Kilns Distributor
Owner, Neil Estrick Gallery, LLC
Posted 17 July 2014 - 01:52 PM
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.
Posted 17 July 2014 - 05:52 PM
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Posted 23 July 2014 - 07:51 PM
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.
Posted 23 July 2014 - 08:31 PM
What was your thickness of application? Is your clay body a smooth one? Did you apply straight after mixing? Just wondering here.
What's the recipe?
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