A reaction of thermal-cracked higher fractions obtained from petroleum naptha with maleic anhydride gives a raw material affording a lighter color petroleum resin of 6 G than ordinarily produced one of 11 to 12 G, measured by Gardner scale. Then, some color components which were not yet reported, removed by the reaction, have been identified from the reaction products to be cyclopentadiene, methylcyclopentadiene, their dimers, methylnorbornadiene and ethylidene norbornene. It has also been found out that their color components are removable from the higher fractions in a considerably high selectivity by the reaction involving Diels- Alder reaction and copolymerization with maleic anhydride.
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