Are dry mushrooms bad?

Online Answer
Dried mushrooms last indefinitely if stored in an airtight container in a cool, dark place. How can you tell if they're bad? "If you smell them and they just don't smell like anything," she says. "They're never going to 'poison.
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If you can plan ahead, soak dried mushrooms gently in cold water overnight for a richer flavor and smoother texture (especially with whole, thick-capped shiitakes). If 10 minutes is all you have, however, boiling water will work fine, too.
Dry pasta: Dry pasta won't ever really expire, but it will lose quality over time. ... There's no need to refrigerate or freeze dry pasta, since it won't extend its shelf-life. Fresh pasta: Fresh pasta should be consumed within two days of buying if kept in the fridge, and two months if kept in the freezer.
Packed with the same nutritional value as fresh ones, dried mushrooms are actually richer in flavor. Plus they last longer--up to 1 year, if stored well.
For example, a poison may become oxidized during the drying process, rendering it non-toxic. ... For the most part, a poisonous mushroom will remain poisonous..