Brown/Orange/Yellowy
negative
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.
Yes it does! :D
If you're using iodine, a negative test will be the color of the iodine solution, which should be a brownish color.
Yes -cooked rice has starch present which is a natural indicator for Iodine
cause iodine(brown) stains the rice
It turns a dark purple/blue colour
it is a yellowish/orange colour but when iodine is present, than it will turn an dark-blue/black colour
iodine solution
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.
The color not change.
negative
When iodine reacts with starch, the solution will turn a brownish colour.
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.
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.
A deep blue colour
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.