What is the best indicator for vitamin C?
An iodine solution is the best way to test for the presence of starch. The distinctive blue-black color which results from mixing starch and iodine is a simple and effective test. Having produced a solution of this blue indicator, some researchers suggest its use as an indicator for the presence of Vitamin C. By adding drops of the solution in question to the blue indicator, the presence of Vitamin C is confirmed by the bleaching out of the blue color. The definitive test for Vitamin C is done with an organic indicator solution of 2,3-dichlorophenol indophenol solution which is available through chemical supply houses. Put about one to one and half inches of indicator in each test tube and add drops of the various juices to be tested until a color change is noted.
