I don't know who needs to hear this, but as a painting student I suggest:
Dish soap and boiling water is WAY better than terpentine or paint solvent to fix dried out brushes.
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Put the brushes in a cup.
Pour a dish soap.
Pour a boiling water to the level it doesn't reach the wooden part.
Leave them to soak and soften
Try to separate the hair on two parts, then on smaller and smaller parts.
At the end, carefully try to scratch off the paint and "break" the hair by carefully pushing it over a surface and moving (like over your palm). If you can't, repeat the previous steps.
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Works even with dried out oil paints. Stronger fluid doesn't mean better.
Tho in harder cases you'd have to repeat the steps a few times to restore the brush fully.
So if you can't afford new brushes, don't throw the old away. Even if they seem helpless, there is a hope for them to be like new.
My art supplies vary depending on what I’m painting. And trust me, I’ve tried them all – oils, watercolors, graphite, charcoal, oil pastels, oil sticks, cold wax, gouache, colored pencils, markers, and Conte crayons, to name a few. Lol. Like most artists, buying art supplies is almost as fun as making art. I’ve had to restrain myself, but it’s not easy!
As far a brushes go, I use a variety, and…