I got a nosebleed a few days ago and was unfortunate enough to have been wearing one of my only white shirts when it did. After a full wash, there were still stains on my shirt. I expected it, as it has happened before, but now I’m curious. What makes blood stains so difficult to clean up and remove? (I googled this, but my 5 year old brain needs an answer a 5 year old would understand)
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