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I worked on this G3948A glaze effect for 40 years! Now I have it. Here are the secrets:
-A fluid-melt glaze having the right chemistry for the iron to crystallize.
-The right amount of iron oxide in the recipe (too much and it over-crystallizes, too little and the effect is compromised.
-A dark burning clay body or engobe underneath, in this case, Plainsman Coffee Clay (we also use L3954F engobe on lighter clays).
-The right firing schedule (initially we used the C6IRED schedule but later we found the C6DHSC worked well also).
-An electronic controller and kiln packing density for a repeatable firing curve.
-Careful control of slurry thixotropy and rheology to enable consistently thick enough application that the melt runs (thus a catcher glaze is needed).
This cost about $20/kg to make in 2024 (enough to make more than two 500ml jars of brushing glaze).
Buy me a coffee and we can talk