To answer my own question and for those of you on a budget, the answer is... YES. It can still be used, at least in my test. Not sure I'd trust it on a long or important job, but with the dried residue in my container to dissolve the agent before adding to my ink, when it dries, and you scrape it out, crushing it back up, and adding water to it again to dissolve, and adding that to ink makes the ink active. I was shocked it worked, but it did, the same as fresh from a new container.