How cool is this video on how to recycle your oil paints from Gamblin Oil paints? It shows you how to recycle the sludge at the bottom of your brush cleaning jar into "new" paint. It also enables you to reuse your cleaning liquid, in this case Gamsol (Gamblin's Odourless Mineral Spirits) so that you never have to dispose of these chemicals but just keep reusing them.
I am going to have to give this a try once I get enough slud, just starting out so it could take awhile but I will post and update when I get there :) I am using baby oil to clean my brushes right now for when I paint the next day but I think I will keep a separate jar with the Gamsol for when I won't be painting the next day. The fact that you can keep reusing the solvent is great as I hate to add anymore crap to the landfills. Plus, talk about getting the most bang for your buck!