orcein
/ˈɔrsiɪn/
noun
- A red-brown dye obtained from certain lichens, used in laboratories for staining cells and tissues.
- The biologist used orcein to stain the chromosomes for the experiment.
- The lab technician prepared a fresh solution of orcein for the tissue samples.
- Orcein is a natural dye that has been used in microscopy for over a century.