How can you tell if a painting is oil or canvas?

Related questions

1. Which paint is best for beginners?
2. What is the best medium for oil painting?
3. Do oil paintings darken over time?
4. What happens if water gets in your oil?
5. Is painting easier than drawing?
6. What is the mixture of oil and water called?
7. What is the best medium to use for oil painting?
8. Is there an app for identifying paintings?
9. Does oil paint dry darker?
10. Do you need oil for oil painting?

Tags

1. #textured
2. #smooth
3. #angle
4. #paint
5. #layered
6. #additive
7. #acrylic
8. #texture
9. #dries
10. #somewhat
11. #looking
12. #rubbery
13. #highly
14. #looks
15. #painting
16. #likely
17. #unless
18. #canvas
19. #thicker