| Chemistry name: | Teichmann's crystals; the chloride of heme
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| M Formula: | C34H32N4O4FeCl.
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| Chemistry structure: | 
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| Properties: |
| Crystals that are brown by transmitted light and steel blue by reflected light. Sinters at 240C. Freely soluble in ammonia water; soluble in strong organic bases; insoluble in carbonate solutions, dilute acid solutions; insoluble but stable in water. |
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| Derivation: |
| By heating hemoglobin with acetic acid and sodium chloride. |
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| Use: |
| Identification of blood stains, biochemical research, complexing agent. |
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