Comparing Bavay (on the left in all photos) and Old Green Gage (the classic Reine Claude, on the right in all photos). Differences in color are very subtle and vary with lighting and the degree of ripeness (one of the two Bavays is a bit more ripe than the other). Brix values vary from about 25 to about 30, depending on how ripe a particular specimen is, but on average Old Green Gage has a bit more of both sweetness and acidity.
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