This substance is an imitation of tea, usually containing fragments, or dust of the genuine leaves, certain foreign leaves, and certain mineral matters, held together by means of paste, usually made from dextrin or starch, usually colored by some one of the facing preparations already noted. This form of adulteration, however, is very seldom made use of. The lie teas are particularly distinguished by their high content of ash, which has been found in some cases to be over 50 percent of their entire weight. Lie tea is easily detected by treating the suspected sample with boiling water. This process disintegrates the aggregation and each of the constituent portions breaks up into separate parts. Lie teas have followed foreign leaves into oblivion.