It forms the essential colouring matter of cudbear (a commercial powdered archil). It is used as a food dye forming dark brown crystals. It is also used as a stain in microscopy to visualize elastic fibers.
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I am trying unsuccessfully to isolate DNA from aceto orcein stained Drosophila salivary gland squashes that were fixed in acetic acid and a coverslip mounted with Coverbond (toluene soluble). They are old slides (about 30 years). I have soaked in toluene, ...
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