What is Scumbling painting technique?

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Tags

1. #gives
2. #painting
3. #variation
4. #added
5. #scumbling
6. #depth
7. #which
8. #sense
9. #layer
10. #broken
11. #color
12. #scratchy
13. #through
14. #technique
15. #result
16. #speckled
17. #lower
18. #another