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en.wikipedia.org/wiki/Iodine_test

The iodine test is used to test for the presence of starch. When treated with iodine solution—iodine dissolved in an aqueous solution of potassium iodide—the triiodide anion (I3−) complexes with starch, producing an intense blue/purple colour. ... the iodine solution comes into contact with starch, it turns dark blue/ purple.

www.chemistryviews.org/details/education/10128441/Why_Does_Iodine_Turn_Starch_Blue.html

Dec 6, 2016 ... Iodine Test. Using iodine to test for the presence of starch is a common experiment. A solution of iodine (I2) and potassium iodide (KI) in water ...

chemistry.elmhurst.edu/vchembook/548starchiodine.html

Starch: Plants store glucose as the polysaccharide starch. The cereal grains ... See the graphic on the left which show four views in turning from a the side ... Starch amylopectin does not give the color, nor does cellulose, nor do ... Only iodine element in the presence of iodide ion will give the characteristic blue black color.

www.quora.com/When-we-add-starch-to-iodine-solution-why-does-the-colour-of-the-solution-turn-blue

Starch and Iodine. Plants store glucose as the polysaccharide starch; the cereal grains (wheat, rice, corn, oats, barley) as well as tubers such as potatoes are also  ...

www.futurity.org/iodine-starch-1232362-2

Aug 23, 2016 ... Research on photovoltaic materials has solved a long-time chemistry mystery: Why does an iodine solution turn blue-black when starch is ...

www.reference.com/science/iodine-turn-starch-blue-70931cf7c358f2e2

Starch when mixed with Iodine turns a deep shade of blue because starch contains amylose. Amylose is a soluble component of starch as well as other...

www.madsci.org/posts/archives/2003-06/1055390550.Bc.r.html

Jun 11, 2003 ... Plant starches are composed of two kinds of polysaccharides, ... Iodine will also react with amylopectin, but with a purple color rather than blue.

www.webexhibits.org/causesofcolor/6AC.html

When starch is present, the iodine changes from brown to blue-black or purple. ... A solution of corn starch in water (left) turns purple while the milk (right) ...

montrealgazette.com/opinion/columnists/the-right-chemistry-when-iodine-meets-starch-the-result-is-predictably-blue

Jul 15, 2016 ... Many a student has been impressed by cutting a potato in half and turning it blue with tincture of iodine. Indeed, an iodine solution is a common ...

.ask.com/youtube?q=Why+Does+Iodine+Turn+Starch+Blue&v=Eo8WyOSBdG8
Feb 17, 2014 ... Why Does Iodine Turn Starch Blue? Iodine turns starch blue because starch contains amylose which responsible for the formation of a deep ...