That makes sense! I have used a lot of non-R XTOL and really like the developer. I have also developed with a lot of Diafine. But I still prefer one shot developers because I got through spurts of being very active and then not for awhile. I have had to throw out a lot of developer over the years because I let it sit too long.The reason I'm interested in PC-512 is that I would like to have a one-shot developer equal to Xtol-R with long keeping properties. I like and use Xtol-R a lot, but sometimes I just want to use a one-shot developer. It would be great to keep at my cottage instead of trying to lug Xtol-R up there.
I suspect that with Mark's freezing method this will last a long time. I may make up a bigger batch and do just that.