Powdered dye concentrate soluble in alcohol or water. Hint: For the most rapid dissolve in water make a slurry of dye first in vinegar and then add water. The physical appearance often belies the intense, startling colours of these dyes. The picture is of the powdered dye, a swab with 100% denatured alcohol (DAA) and a colour reference chart.See here for 100% DAA spirits (Denatured Absolute Alcohol). Smaller quantities available packed by volume in reusable, laboratory rated, storage containers.