How to soften kneaded eraser?

I have two just out of the package Prismacolor erasers, one is so hard it cracked, but won't knead, and the other is pretty stiff.  I was hoping there was something one could add to make it soft.  Videos I looked at suggested working in graphite powder, which is impossible in one case.  Other videos I watched didn't actually answer the question in their title.  It would pretty much have to be a solvent in the case of the hardened one.

Any tips?

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