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2. Synthetic alexandrite - Wikipedia

   en.wikipedia.org/wiki/Synthetic_alexandrite

   The Inamori synthetic alexandrite had a cat's eye variety, which showed a distinct color change. The eye was broad and of moderate intensity. Specimens were a dark greyish-green with slightly purple overtones under fluorescent lighting. The eye was slightly greenish-bluish-white and the stones were dull and oily.

3. Chrysoberyl - Wikipedia

   en.wikipedia.org/wiki/Chrysoberyl

   The alexandrite variety displays a color change dependent upon the nature of ambient lighting. Alexandrite results from small scale replacement of aluminium by chromium ions in the crystal structure, which causes intense absorption of light over a narrow range of wavelengths in the yellow region (520–620 nm ) [ 10 ] [ 11 ] of the visible ...

4. Alexandrite effect - Wikipedia

   en.wikipedia.org/wiki/Alexandrite_effect

   The Alexandrite effect has also been observed in some other minerals, such as fluorite, sapphire, kyanite, monazite, spinel, garnet, tourmaline, and rare-earth oxalates. Not to be confused with the alexandrite effect, some minerals also exhibit pleochroism. The former is a response to different wavelengths of light in general, the latter an ...

5. Sapphire - Wikipedia

   en.wikipedia.org/wiki/Sapphire

   A rarer type, which comes from the Mogok area of Myanmar, features a vanadium chromophore, the same as is present in Verneuil synthetic color-change sapphire. Virtually all gemstones that show the "alexandrite effect" (color change or 'metamerism') show similar absorption/transmission features in the visible spectrum. This is an absorption band ...

6. List of inorganic pigments - Wikipedia

   en.wikipedia.org/wiki/List_of_inorganic_pigments

   Egyptian blue: a synthetic pigment of calcium copper silicate (CaCuSi 4 O 10). Thought to be the first synthetically produced pigment. Han blue: BaCuSi 4 O 10. Azurite: cupric carbonate hydroxide (Cu 3 (CO 3) 2 (OH) 2). Basic copper carbonate: Cu 2 (OH) 2 CO 3. Iron pigments. Prussian blue (PB27): a synthetic inert pigment made of iron and ...

7. FDA may finally ban artificial red food dye from foods - AOL

   www.aol.com/fda-may-finally-ban-artificial...

   All color additives must be approved by the FDA before they are used in food sold in the U.S. There are 36 FDA-approved color additives, nine of which are synthetic dyes. This includes the two red ...