Is my watercolor paint too old?

Hi everyone
I just bought a few tubes of watercolor paints and my cobalt blue came out separated from the filler. I take it the paint tube has been sitting in that shop for a while and is older than I think. I am new to watercolor and I have listened to many tutorials some of which say that the paint is too old when it separates from the filler. I don’t understand why that is. These pigments are mineral aren’t they? Do they degrade and lose brilliance? Help!

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Yes. They also dry out wehn they are too old. I had the same problem.