Black perylene-based pigment and process for producing the same

A black perylene-based pigment comprising a solid solution composed of at least two compounds selected from the group consisting of compounds represented by the following formulae (I) to (IV):

• wherein R1 and R2 may be same or different and are independently —(CH2)n—X, wherein X is hydrogen atom, methyl group, alkoxy group, hydroxy group, phenyl group, 4′-(azophenyl)phenyl group, alkylphenyl group, alkoxyphenyl group, phenol group, halogenated phenyl group, pyridyl group, alkylpyridyl group, alkoxypyridyl group, halogenated pyridyl group, pyridylvinyl group and 1-naphthyl group, and n is an integer of 0 to 5;
• and R3 and R4 may be same or different and are independently phenylene group, alkylphenylene group, alkoxyphenylene group, hydroxyphenylene group, halogenated phenylene group, pyridinediyl group, alkylpyridinediyl group, alkoxypyridinediyl group, halogenated pyridinediyl group and naphthalenediyl group, said R3 and R4 being respectively bonded to adjacent positions of an aromatic ring of R3 and R4 to the respective nitrogen atoms.