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2. Cobalt blue - Wikipedia

   en.wikipedia.org/wiki/Cobalt_blue

   Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with aluminium(III) oxide (alumina) at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl 2 O 4. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue.

3. Blue in culture - Wikipedia

   en.wikipedia.org/wiki/Blue_in_culture

   Cobalt blue, a pigment of cobalt oxide-aluminium oxide, was a favourite of Auguste Renoir and Vincent van Gogh. It was similar to smalt, a pigment used for centuries to make blue glass, but it was much improved by the French chemist Louis Jacques Thénard, who introduced it in 1802. It was very stable but extremely expensive.

4. Tanzanite - Wikipedia

   en.wikipedia.org/wiki/Tanzanite

   A test of the stone with a dichroscope can easily distinguish these from genuine tanzanite, as only tanzanite will appear doubly refractive: the two viewing windows of the dichroscope will display different colors (one window blue, the other violet) when viewing genuine tanzanite, while the imitation stones are all singly refractive and will ...

5. Marian blue - Wikipedia

   en.wikipedia.org/wiki/Marian_blue

   This tradition can trace its origin to the Byzantine Empire, from circa 500 AD, where blue was "the color of an empress". A more practical explanation for the use of this color is that in Medieval and Renaissance Europe, the blue pigment was derived from the rock lapis lazuli, a stone imported from Afghanistan of greater value than gold. Beyond ...

6. The Most Beautiful Cobalt Blue Landmarks, According to ... - AOL

   www.aol.com/most-beautiful-cobalt-blue-landmarks...

   Luis Barragán’s Casa Gilardi: Mexico City, Mexico. For interior designer Nick Olsen, a trip south of the border comes to mind when he considers the most striking Cosmic Cobalt landmarks. “I ...

7. Old Navy's Break a Sweat Sale has activewear from $2 — shop ...

   www.aol.com/lifestyle/old-navys-break-a-sweat...

   Complete with a 4.5-star rating from more than 4,370 Old Navy shoppers, this longline bra is on sale from as low as $8! You can nab it in a ton of different colors that range from green to maroon ...