Using expired paper, where to start

[Leigh]

X = 1000/100
X = 1

Is that the "new" math?

- Leigh

[Eric Woodbury]

Really depends on what you expect to get from this experiment. I'd pull a sample sheet from each batch and develop it as is. See how much fog is there. Maybe it's good and maybe not. I was printing the other day with what I thought was relatively fresh paper, but it was so badly fogged after only a few years in my darkroom (and it doesn't get hot in there and no radioactive waste nearby). I'm going to make black paper out of it as any other use is not worth my time.

Good luck. YMMV

[stawastawa]

IT sounds like the OP has done some testing already. Sounds like maybe using the fog restrainer will be helpful.

I'd recommend printing some images you have printed before and seeing how well you can match. Of course vision can change with time so you may find a better rendition of an old print too!

And if you dont like it, try and lith! or lumen! or chemigram! or make geometric abstractions / photograms.

Really depends on what you expect to get from this experiment. I'd pull a sample sheet from each batch and develop it as is. See how much fog is there. Maybe it's good and maybe not. I was printing the other day with what I thought was relatively fresh paper, but it was so badly fogged after only a few years in my darkroom (and it doesn't get hot in there and no radioactive waste nearby). I'm going to make black paper out of it as any other use is not worth my time.

Good luck. YMMV

What will you use black paper for?

[Greg]

Thanks all. Now I know what the container of Benzotriazole was doing in my darkroom.

Greg

[domaz]

Here's another possible flow chart for expired paper:

Step 1: Fix out the paper and wash it
Step 2: Use it to make Carbon transfer prints.

[Doremus Scudder]

1 gram per liter (1000 cc) is 0.1%, right?

Yes indeed! I think this is the second time in a couple of weeks I've made this error! Hope it doesn't confuse anyone.

0.1% is the dilution I was going for, not 1%. Thanks for pointing this out, Koran.

Doremus

[tgtaylor]

Problem: How many mL is 1.375% of 25mL?

Solution:

(X/25mL)*100% = 1.375%
(X*100%/25mL)= 1.375%
X*100% = (25mL*1.375%) = 34.375%mL
X = (34.375%mL/100%)
X = 0.344mL
X = 0.34mL

Thomas

[Tin Can]

Since Slide Rule days, I always figure my decimal point first.

But I forgot how to use a slide rule, got one right here...

Now, how about significant digits...

[koraks]

Yes indeed! I think this is the second time in a couple of weeks I've made this error! Hope it doesn't confuse anyone.

0.1% is the dilution I was going for, not 1%. Thanks for pointing this out, Koran.

Doremus

Thanks for taking it the right way and my apologies for my pedantry
The reason I pointed it out was because I've frequently run into posts (not just here) on alt processes and they would involve formulae that I couldn't figure out if they were correct or not. Case in point was the mention of someone developing Van Dyke brown prints in a 'very weak' solution of rodinal, namely 1%. Well, that's just 1+100 basically and I can assure you this will turn Amy van dyke print pitch black regardless if it had received any exposure It's very well possible the author in fact meant 0.1%, which is indeed in the range where something interesting happens.
Again my apologies, this time for the off topic remarks.