the procedures recited in experimental example 1 except that the amount of compound no 1 and no 14 were changed to 0 7 g and 0 3 g respectively weight ratio of compound no 1 to compound no 14 was 70 30 the resultant recording medium was elevated the same as in experimental example 1 and the results were summarized in table 1 a recording medium was prepared by following the procedures recited in experimental example 1 except that the compound no 1 was instead of compound no 8 in an amount of 0 3 g and the amount of the compound no 14 was changed to 0 7 g weight ratio of compound no 5 to compound no 14 was 30 70 the resultant recording medium was elevated the same as in experimental example 1 and the results were summarized in table 1 a recording medium was prepared by following the procedures recited in experimental example 1 except that the compound no 1 was instead of compound no 5 in an amount of 0 5 g and the amount of the compound no 14 was changed to 0 5 g weight ratio of compound no 5 to compound no 14 was 50 50 the resultant recording medium was elevated the same as in experimental example 1 and the results were summarized in table 1 a recording medium was prepared.