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One compound, identified as I, was obtained as yellow crystals on crystallization from a deep red solution of 3 7 ethyl acetate and petroleum.
The solid which separated was collected and crystallized from ethanol to give yellow crystals; yield (61%); m.p. 100 102 °C.
The resulting solid was filtered off, washed with water, dried and crystallized from ethanol to give pale yellow crystals; yield (86%); m.p. 170 172 °C.
The famous topaz rock of the Schneckenstein, in Germany, yields pale yellow crystals that were formerly cut for jewelry.
Commercially available coronene, once purified by sublimation, can be easily crystallised in the laboratory as acicular yellow crystals (subsequently CN) which resemble karpatite to the eye.
Insets show (a) powdered recrystallized CN and (b) a vein of KP (yellow crystals) surrounded by quartz (white crystals) and cinnabar (red spots).
Yellow crystals.
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Small quantities of pale-yellow crystals of coenzyme Q, often called ubiquinones, are almost universally distributed in plants and animals.
Brazil is a famous locality, the well-known sherry-yellow crystals coming from Ouro Preto, Minas Gerais, where they occur in a kaolinitic matrix.
He pulled out a vial full of canary-yellow crystals and began deciphering the molecular structure on the label.
"More intermediates in the production of amphetamines and phenethylamines…" He pulled out a vial full of canary-yellow crystals and began deciphering the molecular structure on the label.
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