Bloom. A term applied to velvets, when by dyeing they are said to glow with a warm color, or luster. Dyers claim that the most important branch of black-dyeing upon cotton goods, is that empolyed for cotton velvets, in which it is desired to produce a rich lustrous effect; the process is long, tedious and uncertain, consisting of successive applications of sumac, acetate of iron, logwood and fustic — the end chiefly aimed at being the production of a black, with a blush or violet bloom.