A couple of years ago, I was trying to develop a workable ^6 clay body, starting with clay I dug from a nearby creek, and several forum members contributed valuable suggestions to that project. After a lot of trial and (mostly) error, including a couple that completely melted in the kiln, I was able to make a few flower pots that now hold plants in my office - but never really found a blend that was 'friendly' to work with, and wound up setting the buckets aside to pursue other things.
I now have some time to re-visit my creek clay - and decided to take a different approach: I want to see if I can develop it into a glaze.
As a starting point, I made some slip, and applied a coating to the inside of a small bowl - and fired at ^5-ish. (^6 on the sitter gives me a near perfect bend on a #5 self-supporting cone, with slight bending on a 6.)
The result is a light cream/butter color, but with the texture of 200-grit sandpaper. And, as could probably be predicted by the texture, is very porous. Obviously not something I can use on a mug or bowl that's going to be handled.
So... I'm once again reaching out to those that have been down this road before me, and asking for suggestions:
What would you add, and in what proportions, to turn this into a "glassier" glaze. (I wouldn't mind if it winds up being a matte finish - but I need to get it smoother, and less absorbent than the clay it's applied to.)
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