Should be, I guess? Protein-based foods are difficult; I'd suggest applying some steady high heat for a while. (I think I've eaten tofu after five days or so without ill effects.)
I think the way it goes bad when it doesn't mold it by going sour or fermenting in some way, and it starts to acquire a smell that the regular bland tofu has not. You can even tell with smoked tofu, so I don't think you'd miss it. And when you stored it covered with its water that starts to look icky too.
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It smells fine so I'm cooking it now.
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