The trap color is made up of certain amounts of the adjacent object colors. The darker trap color that results consists of the separations with the higher screen percent density of the two object colors.
Example:
Color A consists of 100% cyan and 80% yellow, color B consists of 100% magenta and 50% black.
Based on the rule above, the trap color would be made up of 100% cyan, 100% magenta, 80% yellow and 50% black.
A trap color formed in this way is often too dark and, as a result, too noticeable. For that reason, the percentages of the separations used to create the trap color can be reduced. The color reduction only affects those parts of the trap color that originate from the lighter of the adjacent colors.