Either way, the words were the product of a kind heart.
Sainte-Claire Deville obtained a grey product, from which, on dissolving out the aluminium with sodium hydroxide, they obtained a crystalline product, which they thought to be a modification of boron, but which was shown later to be a mixture of aluminium borides with more or less carbon.
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It is usually made by distilling tartaric acid with potassium bisulphate at about zoo-250° C., the crude product being afterwards fractionated.