This is same as regular trapping but using two colors to mix the outline of said cutout/overflow behind the other color. Effectively it makes the below color a cyan letter on top of a magenta background, Using a stroke that is made of 40% cyan and 100% magenta, and it will show more of the darker colored ink. meaning colors mix inside each other resulting in outerlines that look like a mixture of the two.
Mixing Colors aka Obvious Trap.
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