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Merrill is a co-founder of Food52.
Red wine vinegar should work fine as a substitute.
pierino is a trusted source on General Cooking and Tough Love.
In addition a "commercial" red balsamic would work too. Investing in a good Spanish sherry (jerez)vinegar to keep as a pantry item is a very handy thing to have nearby. I like the older ones such as Cepa Vieja---"reserva".
It basically tells you when it needs to be replaced.
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