Q: Is it possible to reuse thinner or turpentine?

A: When you submerge your brush in a washer containing thinner or turpentine and wipe or scrub the bristles on the coiled wire or screen, the pigment particles will eventually sink to the bottom of the container, leaving cleaner thinner at the top. Similarly, if you empty the contents of a brush washer into a storage container, the pigment particles will settle to the bottom of it as well. After a few days of settling, you'll find that the thinner or turpentine is practically clear and ready for reuse.

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How do you age a painting with thinner and linseed oil