AVOIDING SET-OFF
‘Set-off’ is the marking of the underside of a sheet of paper
caused by the transfer of ink from the sheet on which it lays. It can
occur when pressure is applied during guillotining or simply while the
paper is stacked. Set-off is caused by the fact that the ink is still wet,
be carefulb and is most prevalent on uncoated stocks like letterheads. Our process
with which
adds an extra gloss or silk coating to all jobs printed on coated paper.
colours you
This reduces the likelihood of set-off occurring, but you should still be
choose
careful with which colours you choose, and in most cases you will be
fi ne if you limit your choices to the colours on our colour chart.
Let’s just remind ourselves of how process colour is created. As an
example, a mid blue colour consists of 100% cyan ink, 72% magenta ink
and 10% black ink. If we add these percentages together, we can work
out that mid-blue has a total ink coverage of 182% (100% + 72% +
10%). The maximum ink coverage that is possible is 400% (which is of
course 100%C, 100%M, 100%Y and 100%K).
++=BLUE
100% Cyan 72% Magenta 10% Black
We have some guidelines to help avoid set-off. Our recommended
our
ink coverage limit is 225%. This means that, wherever possible, the
colours you use should contain a total of 225% or less when you add
recommended
together cyan, magenta, yellow and black. When it comes to black,
ink coverage
there are other considerations – see page 26.
limit is 225%
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