What two colors make gray other than black and white?

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Tags

1. #which
2. #subtle
3. #yellow
4. #known
5. #whole
6. #colors
7. #artrage
8. #blending
9. #lifeless
10. #greys
11. #these
12. #study
13. #effective
14. #primary
15. #black
16. #together
17. #white
18. #range
19. #tertiary
20. #beautiful