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Old 09-07-2014, 12:41 PM
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Location: Sunny Southern Calif.
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I did a rescue on some stamps that had been used in Acrylic paint. In a large jar lid I put some diluted simple green only deep enough to cover the rubber (not the cushion). Put the stamp face down and left it there for hours. Scrubbed it with a an old toothbrush and put it back to soak some more. This continued for several repeats depending on the amount and the age of the paint. Instead of a needle, I used the point of a bamboo skewer to work in the worst nooks and crannies. You will need to add a bit more to the lid as some is removed each time and some will evaporate.

Those stamps are now pristine. Glycerin may be helpful with old, dry rubber. There is a lot of it in the colorless watermark inks.
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