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If the paint has actually dried, there's naught to be done. If it's just thickened - even severely - it can be resuscitated. I received an ancient pot of Skull White a while back that had turned into something akin to a firm custard - no amount of shaking could even move it, but it had give, if poked. Just broke up the mass with a toothpick and stirred like mad, adding small amounts of water as I went. After a while, it had loosened up to the point that I could switch from stirring to vigorous shaking. Stuff is still viable, years later - a few more drops of water and a good shake every so often keeps it in good order.
Some may recommend additional mediums and they aren't a bad idea, but all you need is water and elbow grease.
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