Hi, I don't know if really dried out rubber can revitalize, but for rubber stamps that I was concerned with getting hard I used a mixture of glycerine and water and that seemed to work to soften them. I put that on the rubber and let it sit rubber side down on a plastic tray. I've also heard some use olive oil, but oil and rubber aren't supposed to get along, so not sure about that. Judikins sells a great rubber stamp cleaner and conditioner you might want to look into. JoAnn's sells that. I hope this helps.
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dried out stamps
