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Cocoa sweatings drain off during the fermentation of cocoa beans and are normally a waste. These sweatings were converted to ethanol and then to a mixture of acids by successive fermentation by yeast and bacteria. Of the acid formed, 25 to 50% was non-volatile and was unidentified. The acid was used to coagulate rubber latex to form RSS No. I smoked sheet rubber which was similar to rubber from latex coagulated with formic acid.

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