According to the producers, the Klingon blood was purple to avoid an R-rating. Also, the use of purple blood was to serve as a visual symbol both metaphorical (showing the vast differences between Klingon and Terran values and ideals) and literal (showing the differences between the two species' anatomies; slamming home why McCoy could never have saved the Chancellor's life). Klingon blood has always been red like Terran blood in all other Star Trek Universe portrayals.

Film

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