Draak found this broken rock and recognized it as limonite, a hydrated iron oxide ore. He decided to do a little experiment: he roasted the lower half under a gas flame for about 15 minutes. This causes limonite to dehydrate, losing water to become hematite. The reddish coloration of the roasted piece indicates the experiment was at least partially successful. Draak plans on further processing the limonite and hematite into yellow ochre and red ochre, respectively, and using the pigments with charcoal and chalk to make primitive art.
via https://bit.ly/3OmEyU7
No comments:
Post a Comment