” did, and I still do. Prove to me otherwise.”
Im certain you are kidding, but in case you think it is hard to prove. The easiest way is go to aa lab have your blood drawn with a vacutainer (a standard blood vial) . By definition there is no oxygen in the tube the blood appears in the tube exactly as in your body it is not blue.
If yo want to get even fancier have them send off simultaneous arterial and venous blood gasses. thsi measures the amount of oxygen in the blood. you wil lsee quite clearly that while the venous blood is deoxygenated compared to areterial blood. It is not blue, though the shade of red may vary between the two
I liek health, though wonder if anyone really thinks or thought blood is blue or is this one of those “myths” that people l;ike disproving but nobody actually believes