Join Date: Mar 2005
Location: England, easily locatable by Google
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Apparently, potassium alum sulphate is available in grocery stores over there in the US, in the canning department (possibly sold just as "alum." Otherwise, I'd try ebay- which is where I got mine. I wouldn't try the soda ash, it'll just make the colours go a bit weird.
Helen mum to five and mistress of mess and mayhem, making merry and mischief til the sun goes down.