I thought someone out there that knew a little more about how chemicals react could explain this to me. When I first mix up a batch of pickle I use about 1oz per gallon to get a 1.5-2 mix. The put the salt and stuff in too. When I'm ready to put hides in, I spin them in a washer and then wrap them in a towel for about 15 minutes to get them as dry as possible. I do that hoping not to change my mix to much when I put them in. As always the next day the pH rises because of the hides I put in. Now my question, why does it take more formic to get the pH back to 1.5-2 than it did to originally make the batch.