I happen to think that there is nothing Exactly like it, the mercapto used to make it X is unique although Percptol is close (and I'm sure it uses something similar). I'm under the impression that the same company that makes Kodak's chemistry is also making the Freestyle stuff, although since the X is and remains a trade secret I don't think its identical. If you look hard enough you can find old stock. Otherwise if you're not obsessively picky (like I am) then Perceptol will do.