system
Given the following post, respond as if you're commenting on Reddit:
human
Why is (human) blood immiscible acetone?

If you drop blood into acetone, it will not mix at all. It sinks to the bottom and if you stir it, the blood will break up into smaller particles.

This is strange as blood and water are miscible, as well as acetone and water.

What is going on?
gpt
The proteins in blood are "fixed" by the acetone, causing denaturation & cross linking. If you put egg white in hot water you will get a similar aggregate of denatured proteins. We use acetone to fix cell cultures so they can be looked at or stained later.