Depending on how the blood dries, clumps or spreads, you will be able to compare your blood stain to a results card. Within minutes, you'll be able to determine your blood type.
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Hydrogen Peroxide For Blood Stains: How To Remove Blood StainsI’ve researched, developed, and tested dozens of stain removal techniques and laundry solutions over the past 12 years, and few are quite as reliable as using hydrogen peroxide on blood stains.
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