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Water colours in tubes
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Sounds as if they're getting old and drying out. If they become impossible to squeeze out, I would suggest slicing the tube open and preferably digging the paint out and putting it in wells: you can use the split tube as a well, but the sharp edges of the metal could damage your best brushes (and fingers).
There's not a lot you can really do to soften paint that's started to harden in tubes - you could add glycerine, but how to get it to penetrate through the tube? You could TRY immersing the tubes in hot water, which might soften the paint a bit.