Bronzing and Gloss Differential are issue's that sometimes become
apparent due to differing amounts of absorption of ink by the paper's
Bronzing is a phenomenon where, when paper is viewed from an angle,
part of the image seems to disappear or take on a uniform tone
(usually a green/bronze tone, hence the name). It occurs because of
some of the ink laid on the paper is not properly absorbed into the
coating, instead sitting on top of the page. The effect is only
visible from an angle and is generally not a real problem in practical
contexts, however when visible it is quite unattractive.
pigment inksets were the most well known culprits - the Epson 2000P
was notorious, and the original Ultrachrome inkset had bronzing
problems on gloss and semi-gloss papers. The new Ultrachrome K3 and
later printers have pretty much eliminated bronzing as a problem.
Gloss differential is a visible difference in the glossy surface of a
print across areas with different amounts of ink or between areas of the
page printed on versus not printed on. Generally, it's not a huge
problem as it's not easily visible, but it can be visible in direct
viewing of the print and can create an unpleasant appearance.
In general, spraying your prints with a high quality coating, such as Hahnemuhle Protective Spray, will substantially reduce or even
eliminate gloss differential with typical semi-gloss and gloss papers.
super high gloss papers, the spray does work but will leave a visible
semi-gloss texture on the print and it isn't an ideal solution. The best
option is to try another paper but the problem is inherent in current
coating on high gloss papers and there is no perfect solution at this