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Blue bottle reaction video. The blue bottle experiment is a color-changing redox chemical reaction. An aqueous solution containing glucose, sodium hydroxide, methylene blue is prepared in a closed bottle containing some air. Upon standing, it spontaneously turns from blue to colorless due to reduction of methylene blue by the alkaline glucose ...
A color reaction in an acidified, aqueous methylene blue solution containing chloroform can detect anionic surfactants in a water sample. Such a test is known as an MBAS assay (methylene blue active substances assay).
Blue bottle flies are typically 10–14 mm (3 ⁄ 8 – 9 ⁄ 16 in) long, almost twice the size of a housefly. The head and thorax are dull gray, and the back of the head has long yellow-orange setae. [5] [6] The abdomen is bright metallic blue with black markings. Its body and legs are covered with black bristly hairs.
Blue glass bottles were also hung in trees to trap haints and boo hags. [9] [10] As Gullah culture forcibly mingled with white southern culture, the custom became more widely practiced. [2] Additionally, not all Gullah identify with the belief that haint blue can ward off evil spirits, but the historical significance of indigo crops still applies.
Cobalt aluminate, also known as "cobalt blue", [8] can be used in a similar way. Cobalt glass such as Bristol blue glass is appreciated for its attractive colour and is popular with collectors. It is used in the distinctive blue bottles of Harvey's Bristol Cream sherry and Tŷ Nant mineral water. Ming dish, with smalt blue decoration
The pneumatophore or bladder is the most conspicuous part of the man o' war. This large, gas-filled, translucent structure is pink, purple or blue in color; it is 9 to 30 cm (3.5 to 11.8 in) long and rises as much as 15 cm (6 in) above the water.
Beer bottles of different colors. Glass coloring and color marking may be obtained in several ways.. by the addition of coloring ions, [1] [2]; by precipitation of nanometer-sized colloids (so-called striking glasses [1] such as "gold ruby" [3] or red "selenium ruby"), [2] Ancient Roman enamelled glass, 1st century, Treasure of Begram
Like all green bottle flies in its family, the Lucilia coeruleiviridis adult is a metallic blue-green bodied fly. The facial region is white with large red compound eyes. There are also bristles present as well as plumose aristae. The thorax also contains bristles, all of which are evenly paired.