Manufacturer and builder 5, 1877
An improvement in methods for testing wines to detect artificial coloring has been devised by M. Didelot. The suspected wine is poured into a test tube contianing a small ball of gun-cotton. The cotton is then washed carefully in several successive waters. If the wine be pure, the color will wash out of the cotton; if the tint remains, artificial coloring is probable. To test the remaining color, a few drops of strong liquor ammonia are let fall on the cotton. If the ammonia discharges the color, it has been made with fuchsine; if the cotton turns violet, orchil has been used; if greenish, aldeberry juice.