Adobe ILLUSTRATOR 6.0, Online Manual, Page: 729 / 893

729
Trapping with tints
When trapping two light-colored
objects, the trap line may show through
the darker of the two colors, resulting in
an unsightly dark border. For example,
if you trap a light yellow object into a
light blue object, a bright green border
is visible where the trap is created.
To prevent the trap line from showing
through, you can specify a tint of the
trapping color (in this example, the
yellow color) to create a more pleasing
effect. Check with your print shop to
find out what percentage of tint is most
appropriate given the type of press, inks,
paper stock, and so on, being used.