hello dudes. this is my dark eldar army so far. i am a beginner in warhammer
40k. my figures were originally covered in purple metallic as a base colour, but im looking to darken the colour to a point where it looks black, then add purple highlights so it looks more like the kabals vanilla colour scheme. i washed most of the minis with nuln oil (a black wash) to darken it, can you have a look for yourself.
before:

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after:

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any tips to make it darker to an almost purple/black colour?