Recipe from https://www.goonhammer.com/how-to-paint-everything-adeptus-custodes/

1. Basecoat the blade with Kantor Blue
2. Apply the 1st highlight with Sotek Green (mixed with Lahmian Medium )
3. Apply the 2nd highlight with Temple Guard Blue (mixed with Lahmian Medium )
4. Apply the 3rd highlight with Baharroth Blue (mixed with Lahmian Medium )
5. (Optional) Wash the blade with a 4:1 mix of Contrast Medium to Akhelian Green
6. Re-apply the layers above if the wash was too dark or you need to “clean” things up
7. Final Spot Highlight of White Scar to the tip of the sword only