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This is known also as the 'biologic, or Uhlenhuth's test. =Rust Stains.= These are yellowish-red in colour, and do not stiffen the cloth. The iron may be dissolved by placing the stain in a dilute solution of hydrochloric acid, when, on adding ferrocyanide of potassium, Prussian blue is produced. =Fruit Stains= are seldom so dark as blood-stains.
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