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I'm not sure they used one of their color straight out of a pot, especially since I can't remember an instance where they gave the exact recipe.
In the 7th ed. painting guide the recipe for weavers is: chaos black basecoat, screaming pink highlight, then a second highlight of slaanesh grey. Maybe that's what they actually used for the model on the shop's picture, but with many glazes of screaming pink over the black, which go far beyond the typical edge highlights.
Personally I use a mix of VMC Gory red and VMC night blue (1:2), then highlight with pink horror. It's far from a perfect match, but gives a deep purple with a somewhat similar vibe.
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