iodine test

Recently,we just did an iodine test to test if certain food have starch and stuffs. I hope this information will help you.
STARCH:
Plants store glucose as the starch. The cereal grains (wheat, rice, corn, oats, barley) as well as tubers such as potatoes are rich in starch.*-*
Starch Test: Add Iodine to a solution or directly on a potato or other materials such as bread, crackers,sugar or flour. A blue-black color result will show if starch is present. If starch is not present, then the color will stay orange or yellow.
Steps to test iodine in the presence of starch:
STEPS TO TEST PRESENCE OF STARCH IN THE LEAF
1. Boil pieces of leaves in a beaker of water TO KILL THE CELLS AND BREAK THE WALL OF LEAF CELL
2. Heat the pieces of leaf in alcohol for few minutes TO REMOVE CHLOROPHYLL
Alcohol turns to green color- chlorophyll is removed
3. Soak the pieces of leaf in hot water for a little while TO SOFTEN THE LEAF
4. Using a dropper, add a few drops of iodine solution onto the pieces of leaf TO TEST FOR STARCH
LEAVES THAT CONTAINS STARCH TURN TO DARK BLUE COLOUR