RE: Bronzing?

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My understanding, from talking with both Ilford and We-Ink folks, is that
bronzing is most likely to occur on papers that were originally designed for
thermal inkjet printheads such as those found on Canon inkjets when those
papers are used with piezo-style printheads like those found on Epson
printers. The thermal process evaporates some of the liquid in the ink
before it even hits the paper, so absorption is less of a problem. Paper
manufacturers have tweaked their emulsions so that they will work with the
OEM inks of Epson printers most of the time, but non-OEM inks are more
likely to be a problem, and even the OEM inks are sometimes problematic for
these papers, too, unless you lighten pure black to dark gray.

Why bronzing occurs primarily with black ink, and not the colored inks, is
more of a mystery to me. Anybody?

- David

-----Original Message-----
From: owner-epson-inkjet@leben.com
[mailto:owner-epson-inkjet@leben.com]On Behalf Of Nij
Sent: Friday, March 15, 2002 10:59 PM
To: epson-inkjet@leben.com
Subject: RE: Bronzing?


Robert,

This is as much a paper-ink thing as it is an ink thing by itself. Could
your reported issues with 26,26,26 be the point at which the Epson driver
switches from CMY printing to K printing? I have seen something similar
(without bronzing, just a kink in a greyscale) in the mid-shadows... but I
never got around to isolating it to 26!

I think bronzing is partially to do with over-inking, and partially to do
with inks not being absorbed into the paper properly. I have learnt a lot
tonight from the links to the Ilford pages (which are new-ish, and very
informative on the properties of their papers). I commend them for
attempting to explain to people about their paper technologies, when other
companies don't seem to know... or don't want to tell us what the "blah on a
blah blah base with quper white coating" actually means. Now is the time for
ink and paper companies to realise that we (the resellers) and we (the
customers) need to know this stuff because we don't all use brand 'X' OEM
carts, or brand 'X' OEM papers ;)

Nij

Nigel Rheam
MWORDS Limited   www.mwords.co.uk   Digital Fine Art

> -----Original Message-----
> From: owner-epson-inkjet@leben.com
> [mailto:owner-epson-inkjet@leben.com]On Behalf Of Robert Snow
> Sent: 16 March 2002 01:29
> To: epson-inkjet@leben.com
> Cc: HJswim2@aol.com
> Subject: Re: Bronzing?
>
>
> Harald:
>
> Bronzing is when you view black or near black in a
> print and it has a copper-like sheen to it.  For
> instance, on a gray scale that I use, the 0,0,0 level
> and sometimes the 26,26,26 level patches exhibit this.
> It is really disturbing (to me).
>
> Some inks simply have blacks that are prone to this,
> and you must lighten the black ink laid down to get rid
> of it.
>
> Odd thing is, a lot of times, moderate bronzing causes
> the 26 level to actually look darker than pure black.
>
> bob snow

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