Do you make Tube Soup? What do you do with your empties? After I use a tube squeezer to extract the last dollop of precious pigment, I cut open the tubes and soak them in water to brew a beautiful watercolour "stock". It makes lovely complex shadowy washes. I want to see if it will evaporate to make the ultimate 'palette mud' bouillon cube. Thoughts? Tips? P.S. I also love @danielsmithartistsmaterials sticks because there's more pigment and less waste! #danielsmithwatercolors #nopigmentleftbehind