Re: gum bichromate

anthony corkhill (corvet@corvet.win-uk.net)
Fri, 09 Jun 1995 23:28:20

>
>Never found the age of the dichromate saturated solution to be a
>problem either. I wonder if the problem is humidity when it doesn't
>develop properly - after all you develop the stuff in water, which is
>about as humid as it gets. When it doesn't come out and the image is
>loss the villian sounds like overexposure to me. The gum all hardens
>as the light penetrates even the dark areas of the negative.e
>
>If you are using the sun as a light source (and I do) this time of year
>I avoid exposing prints between about 11am and 2pm. The exposure
>times are in seconds and you have to hover over the print, ready to
>snatch it at whats hopefully the right moment.
>
>If you are using the sun, try morning and late pm.
>
>Gini

Thanks. I'm using a UV (facial sauna!!) light source. The exposure times are
similar to those I was using when the process worked but I will certainly try
shorter exposures. Using sunlight what exposures work for you? Or could I be
fogging the emulsion before exposure? What type of safelight do you use?
Thanks again , Anthony