What color do you add to yellow to make it darker?

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Tags

1. #produces
2. #richer
3. #colors
4. #another
5. #wheel
6. #yellow
7. #adding
8. #green
9. #opposite
10. #orange
11. #purple
12. #white
13. #complementary
14. #pairs
15. #below
16. #darken
17. #black
18. #color