Adobe Acrobat 7 Professional - Manual (Page 589)

Working with specialty inks or varnishes
Using certain inks involves special trapping considerations. For example, if you are using
a varnish on your document, you don't want the varnish to affect trapping. However, if
you're overprinting certain areas with a completely opaque ink, there is no need to create
traps for items underneath. Ink options are available for these situations. It's usually best
not to change the default settings, unless your prepress service provider recommends
changing them.
To customize trapping with specialty inks:
1. Open the Ink Manager, and select an ink that requires special treatment. (To display the
Ink Manager, see Using the Ink Manager .)
2. For Type, choose one of the following options, and then click OK:
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Choose Normal for traditional process inks and most spot inks.
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Choose Transparent for clear inks to ensure that underlying items trap. Use this option for
varnishes and dieline inks.
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Choose Opaque for heavy, nontransparent inks to prevent trapping of underlying colors
but allow for trapping along the ink's edges. Use this option for metallic inks.
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Choose OpaqueIgnore for heavy, nontransparent inks to prevent trapping of underlying
colors and to prevent trapping along the ink's edges. Use this option for those inks, such as
metallics and varnishes, that have undesirable interactions with other inks.