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The Warlocks at the back are painted in this way.

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]]> http://www.dakkadakka.com/dakkaforum/posts/preList/687759/8593524.page http://www.dakkadakka.com/dakkaforum/posts/preList/687759/8593524.page GMT Mix a grey and black, or get a very dark grey
Drybrush model or highlight
Black wash

See my gallery for some examples]]> http://www.dakkadakka.com/dakkaforum/posts/preList/687759/8597287.page http://www.dakkadakka.com/dakkaforum/posts/preList/687759/8597287.page GMT Glaze eshin gray on rounded edges,
Then glaze the fang over that
then highlight with russ grey
wash in nullin oil to blend it all

That will dive you your blueish gray, here is an example of the outcome.

http://taleofpainters.blogspot.com/2015/05/tutorial-how-to-paint-dark-angel.html

steps 1-5
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Black Primer
Black Base
Silver Drybrush (dark preferred)
PURPLE wash
Bright Silver highlights ( like nicks, edging etc)

This works great for the fantasy range not sure how it would look up 40k.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/687759/8597816.page http://www.dakkadakka.com/dakkaforum/posts/preList/687759/8597816.page GMT