A reddish-brown crystalline dye obtained from logwood and used as a stain and indicator.
- ‘The yellow color of glycogen is difficult to explain, but it may be due to unmordanted hematein.’
- ‘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.’
- ‘Commercial extract of logwood extracted from the wood by boiling water contains both hematoxylin and hematein.’
We take a look at several popular, though confusing, punctuation marks.