What is the Hamon on a katana?

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Tags

1. #parts
2. #pattern
3. #hardening
4. #hamon
5. #created
6. #japanese
7. #effect
8. #scale
9. #literally
10. #called
11. #katana
12. #process
13. #rockwell
14. #different
15. #using
16. #blade
17. #translated