Chronic exposure to Silver or silver dust can cause Argyria. The most dramatic symptom of argyria is that the skin permanently turns blue or bluish-grey.
27. Smarties are flavored as such: White is orange/cream, yellow is pineapple, pink is cherry, purple is grape, orange is orange and green is strawberry.
28. The sun glows a cool blue as it sets in the Martian sky. The red dust in the atmosphere scatters red light, so when anyone looking around would see a reddish sky. Meanwhile, the red wavelengths are filtered out of the direct path of light from the sun, leaving light towards the bluish end of the color spectrum. Those looking at the sun will see it as blue.
29. “Ripe Black Olives” in a can are actually olives which are neither black nor ripe when they are picked. They are picked very green and then cured using dilute brine and lye solutions.
30. Prescription bottles are orange or light brown due to its ability to prevent ultraviolet light from degrading the potentially photosensitive pill through photochemical reactions, while still letting enough visible light through for the pills to be easily visible.
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Oranges are actually green when grown in a tropical climate. They only become orange in color when grown in more temperate climates.
32. eBay once tried changing their background from yellow to white but received complaints. So they reverted it to yellow, then gradually changed it to white over several months. Nobody complained.
33. Green eyes make up only 1-2% of the entire human population, and natural occurring Violet colored eyes do exist.
34. Errant Thai police are required to wear big bright pink Hello Kitty armbands against their dull gray uniform as a form of punishment if they commit petty offenses such as showing up late, parking illegally, and getting in fights with other officers.
35. In the 1880s, Margarine had to be dyed pink in order to prevent confusion between butter substitutes and actual butter.
36Peacock tail feathers
Peacock tail feathers are pigmented brown, but their microscopically structured surfaces make them appear blue, turquoise, and green, and often they appear iridescent.
37. Cyanide was named after the color cyan because it was originally isolated from the Prussian blue dye.
38. Lake Hillier is a bubble-gum-pink lake right on the edge of Recherché Archipelago’s largest island in Australia. The color is permanent and does not alter when the water is taken in a container. It is speculated that the color is either caused by a reaction of sea salt and sodium bicarbonate or by red halophilic bacteria in the salt crusts.
39. In medieval times, Japanese used to dye their teeth black. Dyeing was mainly done by married women, though occasionally men did it as well. It was also beneficial, as it prevented tooth decay, in a similar fashion to modern dental sealants.
40. In modern times, the color Tyrian purple has been recreated, at great expense. When the German chemist Paul Friedlander tried to recreate Tyrian purple in 2008, he needed 12,000 mollusks to create 1.4 ounces of dye, enough to color a handkerchief.
Almost all carrots used to be purple and it wasn’t until the 17th century that most of them became orange.
42. Films were colorized as early as 1902 by hand-painting each frame, resulting in a fantastically bright color scheme.
43. Chickens with white earlobes lay white or lightly tinted eggs, and chickens with red earlobes most commonly lay brown eggs. There are exceptions, of course, but this is the general rule.
44. The color of Facebook is blue because Mark Zuckerberg is red-green colorblind.
45. Some species of birds are capable of seeing a 4th primary color (in the ultraviolet spectrum) totally invisible to humans. It allows them to see a totally different fundamental color, and all derivatives obtained by mixing it with the other three primary colors.
Companies have begun treating their meat with nitrates and then packing & storing the product in a carbon monoxide atmosphere. The carbon monoxide gas in the package slows the discoloration of the meat. Unfortunately, this is a deceptive marketing practice as it only makes the meat look fresh. The meat still spoils normally. The artificially-induced pink color can remain in the meat for a very long time, up to one full year. Companies have been using this technique since early 2003.
47. Color laser printers print a watermark on every page that identifies the printer to reassure governments that the printers wouldn't be used for forgery. Tiny yellow dots are added to each page. The dots are barely visible and contain encoded printer serial numbers and timestamps.
48. The Hubble telescope uses a black and white camera to capture pictures. Scientists take color pictures by putting a blue filter in front of the lens and take a picture, then repeat with a red, then green filter. They then combine the 3 images to create a full-color picture.
49. Nurses and doctors wear green or blue scrubs to help relieve eye strain from constantly looking at red (patient's insides), which is also opposite on the color wheel. They're easier to wash and keep longer.
50. Veterinarians used to believe that dogs saw only in black and white, but studies suggest that they actually do have some color vision. Dogs see the colors of the world as yellow, blue, and gray. Many common colors used for dog toys are actually hard for a dog to see.