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I remember reading in an old official source that the blood was green for that reason - it is full of chlorophyll.

Codex Orks, 2nd edition, 1994 (just dug it out) p6:

Their blood, which is green, carries a symbiotic algae through their veins, digesting and reconstituting damaged body tissue and even rebuilding major organs.

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So Chapter approved is more recent, but is the old codex more significant? Maybe just agree on black blood instead