Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
STAINS from soil.
Then, --> Oxalic Acid Conc.
MACK Amidol
Oed. agent Pyrogallol acid.
Hydroquinone.
Tannic acid.
Conc. HCl
Leaches out with SWCl2
Hematite from
Magnetite