It turns a dark purple/blue colour
starch will not change its own colour but it can change the colour of iodine solution. iodine solution is originally brown. after adding starch, it will turn into dark blue.
When iodine reacts with starch, the solution will turn a brownish colour.
The Iodine test uses Iodine solution, which is usually a brown colour. It is used to test for the presence of Starch. Iodine solution, iodine dissolved in an aqueous solution of potassium iodide, reacts with starch producing a blue black color. If the sample being tested doesn't turn blue-black, then starch isn't present.
The starch solution will turn black, while the distilled water will remain brown, the same colour as the iodine. This is actually because water, normally used as a control, does not contain any starch and as we know, the iodine test is highly specific for the presence of starch hence no colour change other than iodine dissolving in water to form an iodine solution contrary to starch which we know complexes with iodine, to form starch-iodine complex forming the blue-black colour observed
Iodine is famous for testing of the presence of starch. I would assume starch is present in the solution, therefore iodine would turn blue. Originally, the colour of iodine solution is brown.
A deep blue colour
it is a yellowish/orange colour but when iodine is present, than it will turn an dark-blue/black colour
to check the approximatedly amount of starch in it since starch in reaction with iodine a black purple colour is formed
Iodine solution is commonly used to test for starch. If starch is present in a substance (e.g. a leaf which undergone photosynthesis) then the iodien solution would turn blue black. If no starch is present then it remains as light brown.
I am not quite sure what happens when corn starch and iodine are mixed but when corn starch, iodine and water are mixed, it creates a purple solution. The darkness of the colour mostly depends on the iodine. Without the starch with iodine and water, it is deep yellow or brown.
Iodine forms colour complexes with polysaccharides. The colour of the complex depends of the 3d structure of the polysaccharide. Starch is a coiled structure, which turns blue when bound to IKI (iodine solution), whereas glycogen, which is a branched molecule, turns red/brown.
When iodine is added to starch it turns a blackish color due to a chemical reaction.