No, I believe you are thinking of the reaction between iodine and starches or you could be thinking of salt which is now often iodized to prevent clumping when exposed to water.
Because Iodine is a brown element.
Iodine does not react with sugar, it reacts with starch.
cause iodine(brown) stains the rice
It is a violet-dark grey As a gas iodine is violet, as solid is very brown. The color in solutions depends on the solvent - the ethanolic solution is brown. The melted iodine is also brown.
Iodine test is a procedure that tells whether a certain element or the such contains starch (or sugar) in it.In this test, we add iodine solution (with, possibly, KI reagent) to a material [in your case, sugar]. If starch ispresent, a blue-black, somehow purple, color will result, changing the initial color of iodine. If starch amylase (sugar) is NOT present, the color will remain orange/yellowish.
yes
Iodine
Meat does not contain starch. Without starch there is nothing to cause the brown iodine to change color.
Iodine
Brown sugar is brown because of the presence of molasses. Light brown sugar has 3.5% molasses and dark brown sugar has 6.5%.
The colour of the iodine will turn from yellowish brown to dark blue
The two types are Light Brown and Dark Brown. There's also Whole Cane Sugar.