Hi there, Michelle,
Thanks for the info. The landscape painter Scott Christiansen buys empty paint tubes from Daniel Smith art supply and fills them up with leftover neutrals. He separates his neutrals into cool neutrals and warm neutrals so they aren't total mud. The tubes are open at the crimp end so while it isn't quite as hard as forcing toothpaste back into the tube it is still not as easy as it looks. I tried to do this for a while but eventually gave up.
Thanks, folks, for the preservation tips. I'll try the freezer idea again. The last time I tried it I didn't label the container and one of the foraging sugar addicts in my household thought they were little piles of icing... and ate them. Yes, this is a true story.
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