A
tincture is typically an alcoholic
extract of plant or animal material or
solution of such or of a low
volatility substance (such as
iodine and
mercurochrome). To qualify as an alcoholic tincture, the extract should have an
ethanol percentage of at least 25–60% (50–120
US proof). Sometimes an alcohol concentration as high as 90% (180 US proof) is used in such a tincture. In herbal medicine, alcoholic tinctures are made with various ethanol concentrations, 25 eing the most common.