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majeranek
The color comes from Thiocyanatoiron ions. Skin was rubbed with a cotton ball soaked with a solution of thiocyanate ions, and that knife was covered with a solution from of iron(III), which has yellowish color. When solutions have combined, these ions reacted together forming blood red [Fe(SCN)]2+.
Reposted fromgruetze gruetze viabiolchem biolchem

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