Expired film & plates exposure, development, images Quest

[Tin Can]

Thanks SOS, great usable advice.

I shot a couple 1940's 1/4 plate glass negs a few years ago, without any knowledge. Yes mottling, emulsion edge lift were present, but serendipity reigned.

A fool's errand as it were. Perhaps not welcome in the Land of LF Perfection.

[Bill_1856]

How very neat! Lucky you.
The best way to determine sensitivity without shooting several plates, would be to shoot a graduated gray scale strip.
For developing, Rodinal sounds good. First try development by inspection (if you have the experience).
If not, try Stand Development in Rodinal 1:50.
Another thought would be Diafine. I'd extend the three minutes in each solution to five.
Good luck!

[Tin Can]

Ordered Benzotriazole and Bromide, Freestyle wins the price war!

Since the advice is ISO/ASA 1, I will shoot full noon Sun outside., with DS pull steps.

I can't find my home printed step graduated gray scale. I'll look again.

[coisasdavida]

My experience is mainly based on 400 speed 35mm film expired from 10 to 20 years.
What I do is overexpose 1 stop per decade and keep development with DK-50 as short as possible.
DK-50 has a bunch of bromide and some kodalk to bring back some contrast that was lost.