To claim blood is anything but red is pedantry of the highest order.

The sky is sometimes orange, grass is sometimes yellow, bananas are sometimes green...

"purple-tinted red" is ambiguous between "red with a tinge of purple" and "purple with a tinge of red." I would have chosen the former, but I just went with "red" instead.

I am curious about the linguistic aspect of this question as opposed to a scientifically precise definition of its color. I got in a heated debate with someone about how the average person would describe the color of blood, so now we have this.

When I mentioned many sea creatures have blue blood, they argued that blood was some level of blue too. I argued most people would just say it was red, they disagreed.

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