Why Potatoes Turn Green. Potatoes turn green when they’re exposed to sunlight. As the plant prepares for photosynthesis and sprouting (by producing green chlorophyll), it develops a bitter, poisonous chemical (solanine) to discourage hungry animals from eating it. The green color serves as a warning that toxic solanine is present.
http://www.todayshomeowner.com/are-green-potatoes-poisonous/
Solanine is a glycoalkaloid poison found in species of the nightshade family (Solanaceae), such as the potato (Solanum tuberosum), the tomato (Solanum lycopersicum), and the eggplant (Solanum melongena). It can occur naturally in any part of the plant, including the leaves, fruit, and tubers.
https://en.wikipedia.org/wiki/Solanine
That is the weight of a large baked potato. The report noted that most green potatoes never reach the market. Still, to avoid the development of solanine, it is best to store potatoes in cool, dimly lit areas, and to cut away green areas before eating. Another good rule: if it tastes bitter, don’t eat it.
http://www.nytimes.com/2007/07/03/health/nutrition/03real.html
How To Prevent Green Potatoes. Hill Your Plants: In the garden, green potatoes mean there’s not enough soil. It’s customary to “hill” potato plants by mounding soil 4”- 6” high around the stems. Check your garden after rainstorms, to make sure the soil hasn’t washed away.
http://www.todayshomeowner.com/are-green-potatoes-poisonous/
(6 kg) of dehydrated potato products. Potatoes are often thought of as a comfort food — richly mashed with butter and sour cream or crisply fried in vegetable oil. But when prepared in these ways, they can lead to weight gain, diabetes and heart disease, according to the Harvard School of Public Health.
http://www.livescience.com/45838-potato-nutrition.html
Potatoes are also a good source of potassium. All potatoes are potassium rich, Jarzabkowski said. They have even more potassium than a banana, and a lot of it is found in the [potato's] skin.. She noted that the outer potato peel also contains a good deal of fiber.
http://www.livescience.com/45838-potato-nutrition.html
It sounds like a joke, or perhaps just an urban legend that grew out of Dr. Seuss’s “Green Eggs and Ham.” But food scientists say this one is no myth. The reality is that green potatoes contain high levels of a toxin, solanine, which can cause nausea, headaches and neurological problems. Potatoes naturally produce small amounts of solanine as a defense against insects, but the levels increase with prolonged exposure to light and warm temperatures. The green color is actually caused by high levels of chlorophyll, which by itself is harmless.
http://www.nytimes.com/2007/07/03/health/nutrition/03real.html
Among the thousands of varieties of potatoes, red, blue and yellow potatoes are the most popular. Credit: AlenaNex | Shutterstock. Potatoes are the No. 1 vegetable crop in the United States and the fourth most consumed crop in the world, behind rice, wheat and corn, according to the U.S. Department of Agriculture.
http://www.livescience.com/45838-potato-nutrition.html
Potatoes naturally produce solanine and chaconine, a related glycoalkaloid, as a defense mechanism against insects, disease, and herbivores. Potato leaves, stems, and shoots are naturally high in glycoalkaloids. When potato tubers are exposed to light, they turn green and increase glycoalkaloid production.
https://en.wikipedia.org/wiki/Solanine
The green colour is from chlorophyll, and is itself harmless. However, it is an indication that increased level of solanine and chaconine may be present. In potato tubers, 30–80% of the solanine develops in and close to the skin, and some potato varieties have high levels of solanine. Some potato diseases, such as late blight, can dramatically increase the levels of glycoalkaloids present in potatoes.
https://en.wikipedia.org/wiki/Solanine
what harmful chemical is found in green skin of a potato
Solanine is a harmful chemical that found in green skin of a potato. The  harmful chemical solanine is found in green skin of a potato.