Blood
Blood contains haemoglobin — an iron-rich protein. Hot water literally cooks it into the fabric. Cold water and hydrogen peroxide (which reacts with the iron) are the key tools.
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Frequently asked questions
Why must blood be treated with cold water?
Blood contains haemoglobin, a heat-sensitive protein. Hot water denatures (cooks) it, causing it to permanently bond to fabric fibres — exactly what happens when you cook meat.
Does saliva remove blood?
Yes, on small fresh stains. Human saliva contains amylase and other enzymes that break down blood proteins. It works because it's cold and slightly enzymatic.
How do I remove period blood from sheets?
Rinse with cold water immediately, apply hydrogen peroxide, let fizz, rinse cold. For dried stains on sheets, soak in cold salt water before applying peroxide.