Mix together saltpetre, luru vopo vir con utriet [powdered charcoal], and sulphur, and you will make thunder and lightning, if you know the method of mixing them. (Roger Bacon)

Mix together saltpetre, luru vopo vir con utriet [powdered charcoal], and sulphur, and you will make thunder and lightning, if you know the method of mixing them.

Roger Bacon

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charcoal con lightning method mixing mix saltpetre sulphur thunder vopo

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