Rod Hewitt writes:
"Dave" wrote in
:

Sorry to ask this at this point, but does it make any difference as to
which colour is put down first?

Yes.

This is true of xerographic toners as well.

When making colour plates, the dot pattern is produced at
different angles for each ink (up to a point, difficult with large
numbers of inks) so that there is less chance of a later ink completely
obliterating an earlier one. The differing angles basically ensure that
the dots in one layer cannot perfectly align with the dots in another
layer. This lessens the criticality of the printing order.

Actually, I believe this has nothing to do with layered combinations
depending on printing order - after all, shifts in relative dot
position can't reverse the order, only move from dot-on-dot to
dot-off-dot. And *that's* the key - the color you get in these two
cases (even for standard, transmissive inks) will be different,
certainly because of overlap in the absorption spectra and possibly
because of physical effects changing the uptake of the second color.

--
Mark Jackson - http://www.alumni.caltech.edu/~mjackson
Learning without thinking is useless. Thinking without
learning is dangerous. - Confucius