leaning towards metallic grey because I think cinder reads fairly warm, almost brown, in natural light. Unfortunately all these photos were taken under the strong fluorescent light of the granite yard. The perimeter counters are true black, so I don't want the sink to clash with those counters. This slab shown is for the island.

closeup of granite, pretty true to color:
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cinder and metallic grey sample, with island cabinet sample
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metallic grey:
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cinder:
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Would the metallic grey be a mistake with this slab?