Digital BW, The Print

Seth Rossman <seth@...> wrote:
>
>... some commercial instances [of Triton] have H2O2 added at .22%.
>...

Because Photo Flo 200 is composed of only 5% to 10% Triton X-100, we're talking about a rather small amount of potential H2O2.  Whether Photo Flo is among those that has any at all is also unknown.  Additionally, since I believe H2O2 breaks down to (2) H2O + O2 in water, whether it would be in the dilute ink mix for long is an open question.

At any rate, I was trying to think what impact some residual H2O2 might have on the ink.  I suppose it might bleach the carbon -- oxidize it.  In that case, the Carbon-6 (home brew base) inks might lose some density in the bottle compared to the same blend of Eboni-6.  To test whether this is happening, I did a draw-down test of quite old Carbon-6 LC (9% Eboni) and Eboni-6 LC (9%).  There was no density decrease in the Carbon-6 version relative to the (newer) Eboni-6 version.

Bottom line, I'm not going to worry about this with at least Photo Flo.  It'll be an issue to keep an eye on if I start using concentrated Triton X-100 (like perhaps when Kodak pulls the plug on Photo Flo 200, as they have on Photo Flo 600, apparently).

Thanks for alerting me to the potential issues relating to this chemical.  It's all useful information.

Paul
www.PaulRoark.com