I am making pickles and was thinking of trying balsamic vinegar. Is it a stable vinegar for canning pickles?

Try a mix of Balsamic, rice wine vinegar and. Apple cider vinegar. Ratio is 10% Balsamic, 20% rice wine and 70% cider. Worked for me.

Janice, why don't you try a very small mini jar with the balsamic just for experimental sake?

I don't think balsamic vinegar would work very well for most pickles. For one thing, it's dark in color, and would make the brine muddy. Most of what we know as "balsamic vinegar" is a blend of various vinegars. I would stick with a more traditional white vinegar or apple cider vinegar until you have more experience with pickles.