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To Stiffen Bristles
These are usually stiffened by immersing for a short time in cold alum water. 675. How to Prepare Essence of Cognac. Take 1 ounce oil cognac-the green oil is the best; put it in gallon 95 per cent. spirits. Cork it up tight, shake it frequently for about 3 days; then add 2 ounces strong