Genuine Vermillion/Cinnabar
Despite vermillion’s charm, we found the lightfastness tests done by the legendary Gunzorro to be very helpful. His tests of genuine vermillion displayed darkening in bright sunlight over time: https://www.wetcanvas.com/forums/topic/vermilion-test/page/5/
Please visit the manufacturer website for composition and health and safety information. Please also do your own research and seek third party toxicology experts for information on dealing with specific hazardous materials.