Crystal field theory makes predictions about how a transition metal ion's structure is ... create the red color of a ruby and ...

“Arsenic is a heavy metal and does have some toxicity associated with it, principally, either inhalation or ingestion,” he says. The relative risk of emerald green bookcloth “depends on ...

Crystal field theory makes predictions about how a transition metal ion’s structure ... They cause the emerald to absorb blue and red light, leaving the green for you to see.

"Two of the most 'poisonous' of those pigments are emerald green, which contains arsenic, and chrome yellow, which contains lead and chromium." These heavy metal pigments stopped being used around ...