from The Century Dictionary and Cyclopedia
- n. A crystalline compound, C20H16O4, made by reducing phenolphthalein with zinc dust and caustic soda. It melts at 225° C. and is easily oxidized to phenolphthalein.
Sorry, no etymologies found.
A bit of suspected blood is collected on a swab, and a drop of phenolphthalin reagent is added to the swab.