Paint solvents, thinners, and thickeners are often toxic. I don’t use any of these, except for turpentine to deep-clean my brushes (which I do outside).
Oil painting mediums (such as thickeners and thinners) tend to be an artist’s best friends. I had some favorite mediums that were toxic, but after some intense experimenting around, I found and fell in love with two that aren’t – walnut oil to thin the paints, and Gamblin Solvent-Free Gel as a thickener.
And I try my best not to eat the paints 🙂
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