Figure 3. The iodine test with table sugar (left), grape sugar (middle) and grape juice, one minute after adding them to the iodine test solution.

From

The Iodine Test for Reducing Sugars – A Safe, Quick and Easy Alternative to Copper(II) and Silver(I) Based Reagents

Holger Fleischer

World Journal of Chemical Education. 2019, 7(2), 45-52 doi:10.12691/wjce-7-2-3