Blood is made up of fluid (essentially, water with some electrolytes) and cells floating around in the fluid (red blood cells, white blood cells, etc). Milk is also mostly water, with some fats and protein. The water is the only thing that would evaporate out of the solution when heated. Heat it for long enough though and you’d probably destroy the red blood cells and white blood cells into little bits.
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FatLegTed t1_ixyy1j5 wrote
This doesn't really make any sense to me.
Are you saying that you think there's (minute amounts) of blood in cow's milk?
And you think that that's what makes it not vegan?