Ash is 33% of a Nuka glaze,. And as you can see in the above image. Preparation plays a big part.
Recipe for Nuka glaze, cone 10 Oxidation
Wood ash_33
Silica_33
Potash Feldspar_33
Water_1.5 times the weight of dry ingredients.
optional
add 3% bentonite to help keep the glaze in suspension.
The downside of bentonite though is, it takes a lot of effort to sieve the first time.
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