This glucose is: After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black. Variegated leaves ... right shows a positive test for starch in the ...

Coleus 'ColorBlaze El Brighto' showing the brightly-colored variegated leaves - JHVEPhoto/Shutterstock There are quite a few ...

Destarch a variegated plant – partly green and partly white. Make a drawing of the leaf. Place the plant in bright light for several hours. Test the leaf for starch using the 4-step starch test.