Acetic acid stop bath

[Rhodes]

Last thursday I went to my anthropologi department and end it, has always, goin to the old photo lad, now used for other things. I got a bottle of acetic acid for my father (he uses to store other kind of liquids), but this one is still almost full.
I thought using to do a stop bath insted of dumping the acid. So, can I do a big quantity of stop bath and go using, like the fixer? And the ratio is 1:3? Should I use destiled water?
Normally, my stop bath is destiled water, one minute, continuous agitation.

 

[Roger Hicks]

Why do a big quantity? Mix it up as you need it.

Assuming it's glacial, remember (a) it's corrosive and (b) Always Add Acid To Water (not water to acid).

Cheers,

R.

 

[MartinP]

Also, if the acteic acid is indeed glacial (meaning containing almost no extra water) then you can dilute it to only a few percent instead of 1:3. With any luck there is a label on the bottle which should confirm what is actually in there. That could be a couple of years of stop-bath! Of course there is no indicator dye in the solution if you work like that, so you can either use ph detector-paper, or use the stop bath only a few times - for either way, it needs to be acidic to continue working so eventually the alkaline developer carry-over will make it ineffective.

After Rogers essential advice about adding the acid to the water, there are extra mixing tips are here, among other places.

 

[Rhodes]

Yes, it's glacial (100%). And yes, I know about diluting acid in water, but I did saw once the reaction of adding water to acid in a hotte.