Why is ferric chloride applied to stop bleeding?

Fe3+ ion coagulates blood which is a negatively charged sol. Fe3+ ion coagulates blood which is a positively charged sol. Cl– ion coagulates blood which is a positively charged sol. Cl– ion coagulates blood which is a negatively charged sol.

Fe3+ ion coagulates blood which is a negatively charged sol.

Fe3+ ion coagulate the soluble proteins (present in blood plasma) which are negatively charged.