I've recently completed several batches of whites. In many of these, the initial pH of the juices were in the 3.6 range, but after commpletion, the batches now test in the 3.25 range. I can understand why pH might rise during wine production (MLF, precipitation of tartaric acid), but I don't see why the pH should drop.
The only additives that were put into these whites were the yeast, some yeast nutrients (in appropriate doses), some lysozyme, and also appropriate sulfite to bring them up to the 40 ppm range.
Any thoughts?
Lee