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A few drops of regular ordinary water does the trick for me, if the paint isn´t actually dry.
However, dried paint cannot (afaik) be brought back to life, due to the nature of acrylic paint. Which means it´s water soluble when wet, but not when it´s dry.
(I should at this point insert a sentence saying that this is of cours only my own experience, and in no way meant to be a full survey of the possibilities and limitations of acrylic and other paints, as dictated by the google-fu clans of the interwebs. There, I said it.)
Anyways, back on topic, my advice would be to try bringing them back with water, and if that doesn´t do the trick, bin them.
And then buy colors as you need them, way cheaper that way, than going berzerko on paints, and suddenly having Hawk Turqouise for no apparent reason...
P.S. I still have a few paints in the really really old school hard rubber pots, so old doesn´t necessarily mean useless...
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