25 year old KRST and HCA still good?

[L.J.SILVER]

I've found some Selenium Toner and Hypo Clearing Agent that I've had for 25+ years. The KRST is in the original unopened glass bottle and the packets of HCA powder are also in sealed packets. Should I use them or chuck 'em?

 

[Luseboy]

Haha I'm in the same boat, i got some chems off cl, and most of them are really old. But apparently the rst will last a long, long time. And i'm sure the hypo clearing agent will as well.
I'd say give em a try.

 

[R gould]

I cannot see why the chemistry should not last tat long, with the toner simply try it on an old print and if it works then OK, I have certainly used HCA that has been in an un opened packet for a while, I think the chemical makers will err very much on the cautious side
Richard

 

[Wade D]

I'm still using up boxes of HCA from the 60's. They came from an old studio that shut down 30 years ago. The powder isn't discolored and residual fixer tests come up negative. There is a little clumping from hygroscopic activity but it still works.