RE: bronzing in pt/pd

Jeremy,

If I recall correctly, bronzing can be eliminated by using more emulsion
(sensitizer) or less exposure, or more sensitizer and less exposure, use of
a surfactant like Tween 20, add more platinum to the sensitizer to the mix
(unless NA2 is being used). There could be other reasons that I can't think
of now, I'm sleep deprived this morning :-)

Don Bryant

  _____

From: Jeremy Moore [mailto:jeremydmoore@gmail.com]
Sent: Thursday, April 06, 2006 9:59 AM
To: alt-photo-process-l@usask.ca
Subject: Re: bronzing in pt/pd

Doesn't overexposure cause bronzing and a thinner coat is more sensitive to
exposure ("faster"), therefore the thin coat caused the normal printing time
to be too long = bronzing.

I'm asking if my logic is correct as there are a number of things I am still
trying to sort out with these alt processes.

-jeremy

On 4/6/06, Don Bryant <dstevenbryant@mindspring.com> wrote:

Chris,

>
Question: am I safe to assume that the bronzing is directly related here to

too thin of a coat of solution?
>

In a word, sort of. Too little emulsion and too much exposure can cause
bronzing.

Don Bryant

 
Received on Thu Apr 6 08:11:02 2006