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I've been really fortunate at work to come across a heap of local material, one of the most exciting is a small seam of volcanic ash from Lake TaupeTaupe here in New Zealand, that erupted about 18,000 years ago.  I've used a small amount in a few small batches which has been really good but wanted to ask if it's likely to work as a glaze if I just sprinkle the ash direct onto the wet clay?

Today I made a couple of rough textured chawan bowls and I thought they might be worth trying for a single firing with the ash just thrown onto the wet clay.  Or am I better to biscuit them, add a glaze and throw some ash onto the wet glaze?

Any tips from frequent ash users?

Novice here, so please excuse any ludicrously silly questions above :)

Cheers ,


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You might already be aware but fwiw volcanic ash is a naturally fritted feldspar. It can be substiuted directly for feldspar but requires silica.

In a glaze it brings a bit of iron so makes a nice celadon(in reduction) and can work in a base for a lifetimes worth of glazes.

Edited by C.Banks

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Thanks guys, I found some nice looking feldspar recipes today and will try some substitutes tonight, hopefully fire them this weekend. 

I'll check out BjarnI thanks Tyler


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