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Salt petre was my first thought. Any other thoughts on what it is? Or if it's useful the stuff on the coal. P.s. I wondered if the white stuff was useful not the coal that it'll keep m'stove burning over winter. It'll burn better being free

Thanks for the thoughts I'll be nipping over this weekend and scrape the stuff up and subject to a barrage of tests - my daughter who's just started her chemistry gcse, an old chemistry set of mine, my nose and a spark. Will let you know.

An old lady that I know asked if I wants to clear some coal that had been sat in cellar and was no longer needed. I just been around to see how much there was and noticed some white stuff that seemed to have leeched out. It looks for salt or sulphure? Question: is it useful for anything...