From the experiment, A substance is tested with iodine solution, prior to trial, but the color changes after experimental aqueous iodine does not change color.
Gee experiments, compound A is rice, experimenting with iodine solution before the experiment after experiment, change the color, but do not change the color of iodine solution.
The water from the experiment, compound A is rice, test with iodine solution before the experiment, change color, but after the experiment, the iodine solution doesn"t change color.