We need a phlebotomist who’s good enough to draw venous blood without exposing it to any air & contrast it with arterial blood?
I find it easy to believe oxygen-depleted blood turns blue because I’ve seen anoxic *soils* so gleyed that they were about the shade of a robin’s egg. They turned grey as we watched, after we brought up the core.
Tony Vladusich (npub18zu…xdht) John Carlos Baez (npub1nf4…nqe4) TobyBartels (npub1x4d…6lp6)
