Blue or Purple
When iodine is added to cornstarch, a blue-black complex is formed. This is utilized as a simple test to detect the presence of starch in a given substance.
Blue .
The color of starch after iodine has been added is deep blue to black.
The leaf should turn blue-black when iodine is added, indicating the presence of starch.
A deep blue colour
The colour of the iodine will turn from yellowish brown to dark blue
The product of the reaction between starch and iodine is a blue-black complex known as iodine-starch complex. This complex forms due to the iodine molecules inserting themselves into the helical structure of starch, creating this distinctive color change.
Iodine turns a dark blue or black color when added to starch. This reaction is often used as a test to detect the presence of starch in a solution.
When iodine is added to a leaf with no starch, the leaf will remain its original color (usually green). Iodine reacts with starch molecules, turning the leaf blue-black if starch is present.
Iodine turns blue-black when added to a protein solution such as starch. This color change indicates the presence of complex polysaccharides like glycogen or amylose.
As you know that iodine act as indicator for testing of starch so when a drop of iodine is added to starch it turns bluish black but when added to distilled water nothing happens except the colour of water which turns brown and its is the colour of iodine.
Before iodine was added to salt, people primarily obtained iodine from natural sources such as seafood, seaweed, and plants grown in iodine-rich soil. Consumption of these foods helped to prevent iodine deficiency, which can lead to health issues such as goiter.