- Dear Roderick,
I see that other better printers have answered the question of which
ink to print first. I would only add that you should not ask your
client about nor mention trap in any way to him. It is a technical
subject that will only cause him worry. We have all looked at printed
material all our lives without noticing trap (or kerns for that matter)
unless these subjects were brought to our attention.
On May 1, 2004, at 9:33 AM, Roderick wrote:
> Michael (et al):
> I'm printing black and burgandy for one set and black
> and goldenrod for another set. If I place black down
> first, then burgandy (goldenrod) will trapping at 1/2
> (assuming I'm registered) show all that much. Should
> the client decide how much trapping I need? I'm
> assuming not because I'm printing and not him, I need
> to decide is how much overhang is acceptable to me. Am
> I correct?
> I've printed a few two color jobs with colors in no
> particular order and never specified trapping because
> I just registered. Should I be putting down the
> lighter color first then black or vice-versa?
> Many thanks, Roderick
> --- Michael Barnes <mjbarnes@...> wrote:
>> Traps in offset printing are frequently .25 point
>> (quarter point).
>> Unless black is overprinting, a colour trapping
>> under black can be
>> considerably more (half a point) since it won't show
>> much. Nowadays we
>> trap even less -- around .125 pt -- because we are
>> imaging to direct to
>> plate, which has improved registration.
>> Of course I don't know if numbers that work in
>> offset also work for
>> letterpress. But a 2 pt trap is certainly big. Many
>> rules and text
>> characters are themselves thinner, or not much
>> broader than this, and
>> if the trap is coming in from all directions, such a
>> large number will
>> effectively result in an overprint.
>> Michael Barnes
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One other consideration, in the sequencing of the way you lay down
colors (an after thought), is the tack of the ink. The first color
down should have more tack than the next. Difficult in that the
lighter colors, which need to be laid down first are generally those
with the less tack. It's not all that hard to alter viscosity but a
slight problem since the black is the last to be printed and is
usually a stiffer ink...
Roderick <rxchow@y...> wrote:
> Thank you everyone for sharing your wisdom.
> Best, Roderick
> --- Gary Mordhorst <gary@a...> wrote:
> > Print your color (burgundy or goldenrod) first and
> > print black on top of the
> > color. Keep your trap at 1/2 point, or overprint,
> > based upon the nature of
> > the image.
> > Black ink has enough density to overprint most
> > colors. The big exception to
> > this is in the case of metallic inks, which have
> > metal shavings in the ink,
> > making them more opaque than black.
> > Gary Mordhorst
> > AccuColor Plus, Inc.
> > www.accucolor.com