[CH:1]1([C:7]2[CH:15]=C(C(C)(C)C3C=CC=CC=3)C=C(C(O)=O)[C:8]=2O)[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.[CH3:26][C:27]([C:29]1[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=1)=C.C=CC1C=CC=CC=1>C(=O)([O-])[O-].[Zn+2]>[CH3:15][C:7]([C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1)=[CH2:8].[CH2:26]=[CH:27][C:29]1[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=1100 parts of 3-cyclohexyl-5-(α,α-dimethylbenzyl) salicylic acid was mixed by the use of Nauta mixer (manufactured by HOSOKAWA TEKKOSHO, Japan) with 500 parts of zinc carbonate and 100 parts of α-methylstyrene-styrene copolymer which was obtained by the polymerization of 60% α-methylstyrene with 40% styrene and had a molecular weight of about 2,000. The water content of the resultant mixture was 1.2%. 250 parts of water containing 5% ethyl alcohol was added in the mixture and the mixture was heated at 150° C. for 15 minutes with stirring. Then the mixture was cooled to a room temperature to form a solid mass. The mass was pulverized by a hammer mill to obtain finely divided particles, 80% of which was passed through 250 mesh Tyler standard screen. The obtained color developer contained 1.5% water on the total dry basis.
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