If you're using paint or varnish that can be cleaned up with water, then choose a brush with synthetic bristles.
If you're applying oil-based varnish or paint, a natural-bristle (Black China, Ox-hair Blend or White China)
brush may be a better choice.
Real or natural brush fibers are made from various animal furs and hairs. Synthetic brush fibers are
made from nylon and other plastics.
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