My original colour scheme for the Grey Knights in my Daemonhunters army was done as follows:
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- Black undercoat
- Chainmail base coat
- Thinned blue ink wash
- Mithril highlights
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You can find out more here. However I was not happy with the results which looked too shiny.
Though I had followed the painting guide in the Codex there was one difference, I had used Chainmail and the guide recommended Boltgun metal.
My local store had sold out of Boltgun, but I managed to get a pot the other day from a GW store and had a go at re-painting the Grey Knights and was much happier with the results.