Airtight
Leslie, I've used the film tubes for small bacthes of color I wanted to save briefly, but i've found the paint will dry pretty quickly with even a little bit of oxygen in the space. The metals tubes work perfectly after the mess of putting your new color into them. Maybe someone here can tell us both how to do this without of huge mess.
On this related subject, I have bought several odd colors from Old Holland which sometimes are more expensive than they should be had I mixed them myself (using Old Holland paint). I may mix more and more all the time.
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