Black.
Though it has to be said there are variations and the blackest is the most rare and therefore expensive.
However there are Indian and Chinese blacks though not as deep as the African that do the job.
305 x 305 x 10mm
400 x 400 x 10mm
610 x 305 x 12mm
457 x 457 x 10mm
600 x 600 x 12-15mm
Slabwork available

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