How can you tell if paint is oil or acrylic?

Related questions

1. Does heat make oil paint dry faster?
2. What can I use to thin an oil painting?
3. What's the difference between acrylic and oil paint?
4. Are oil paints toxic?
5. Do you have to let gesso dry before painting?
6. How do you soften an oil painting?
7. What does linseed oil do to oil paint?
8. Is acrylic paint safer than oil?
9. What happens if you paint latex over oil?
10. Can I paint over an oil painting?

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2. #latex
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4. #polish
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6. #touch
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11. #remover
12. #feels
13. #acetone
14. #paper
15. #based
16. #nothing