It’s all chemicals, yes. But synthesizing that all from scratch is way, way beyond us, because many of those chemicals are very complex and there’s loads of them in total. Even “just” making synthetic plasma with all its component substances is an insane feat of biochemical engineering, let alone making the cells. That’s *creating life!* Add to that that our understanding of what exactly those chemicals & cells are/do is far from complete, and the overall goal of making real blood from non-biological sources is the stuff of sci fi.
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