Why is it, when you try to wipe away drops of blood off of a surface, it leaves a behind a thin ring around it which is harder to clean?
In: Physics
I get this same effect when I spill coffee on the kitchen counter. If I don’t wipe it up immediately, when I do, a dark outline of the spill is left behind after the first swipe.
This suggests that the effect you asked about isn’t related to the specific composition of blood, but to fluids in general.
Latest Answers