A student asked me today: does rosin expire? I'd never really thought about it, and I didn't really know how to answer. I figured one of you would know... so? How long can one expect a rosin to stay "good" or do they last forever, or until dropped and shattered? She said that she thought it seemed that her rosin wasn't giving her enough bite, but that her sister's (new) rosin was great. They are the same brand--Motrya Gold. Thoughts?
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