Graphics Reference
In-Depth Information
Most purchasers of printed products don't give ink a second thought beyond specifying
a color. Although it's a good practice to let your printer choose an ink that's appropriate
for the paper (or other substrate) and function of the piece, it's worthwhile to know how
some inks perform as compared to others.
High gloss:
Ink formulation includes a high
content of varnish for maximum sheen.
Most effective when used on coated and
cast-coated stocks. Not appropriate for
heat drying, which can reduce gloss.
Fluorescent:
More opaque and vibrant
than standard inks, fluorescents can also
be mixed with process inks to increase
their vibrancy. Fluorescents don't always
retain their colorfastness as long as
standard inks and may not be suitable
for pieces with a long shelf life or those
that will be exposed to sunlight.
Heat set:
Quick-drying inks used in web
offset. Ink solvents are vaporized as they
pass through a heating chamber at the
end of the press. The ink is then set as
it passes through cooling rolls.
Vegetable-based:
Inks made either
entirely from or from some percentage of
vegetable oil rather than petroleum (e.g.
cottonseed, linseed, soy, etc). Vegetable-
based inks tend to release fewer VOCs
(volatile organic compounds, see glos-
sary). Vegetable-based inks are capable of
performing just as well as an ink that is
petroleum-based, however they may han-
dle differently on press, and some printers
may charge a premium for their use.
Metallic:
Made from a mixture of metal
dust and varnish, metallic inks have the
greatest effect on coated paper. They
have a tendency to rub off if the ink has
been laid down thickly. Some metallics,
such as copper, can also have a tendency
to tarnish. An overlay of varnish can
minimize these problems.
Varnishes and other liquid coatings are applied to protect the inked surface of a piece or
to enhance a design, either by dulling or applying a glossy finish to the surface. A range
of protection and aesthetic possibilities exists, with each type of coating offering its own
set of advantages. As a general rule, varnishes and liquid coatings work best on coated
papers. They tend to be absorbed into uncoated papers, creating a mottled appearance.
Coatings also need to be compatible with the type of ink used. Metallics, and other pig-
ments as well as other ingredients in the ink may present a problem. Be sure to let your
printer know what type of coating or laminate will be used to ensure that a compatible
ink is used for the project.
Search WWH ::
Custom Search