A reddish-brown crystalline dye obtained from logwood and used as a stain and indicator.
- Chemical formula C16H12O6.
- The extract from the heartwood is not a dye until it undergoes oxidation into hematein, which is an acid chromogen.
- Both hematoxylin and hematein are still commonly used for bacteriological and histological stains.
- This is the HCK S grade of hematein, manufactured to specific values for this important use.
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