A granulated colorant as a granulation product of a powdery nigrosine dye,
that has a bulk density of 0.4 to 0.7 g/ml and a hardness of 1 to 20 N. A
high-concentration master batch obtained by blending a granulated
colorant and a thermoplastic resin, which comprises 25 to 100 parts by
weight of a nigrosine dye in the granulated colorant per 100 parts by
weight of the thermoplastic resin. A colored composition comprising a
granulated colorant or high-concentration master batch and a
thermoplastic resin or thermoplastic elastomer.