63.3 MB (2.3 MB compressed)
5760 x 3840 pixels
48.8 x 32.5 cm ⏐ 19.2 x 12.8 in (300dpi)
MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Iodine test on an unripe banana. The skin of unripe bananas is green due to the chlorophyll content of the peel which supplies nutrients (mainly starch) to the fruit. WhenÂ the starch has been stored in the fruit, it is firm and an optimal size. Testing the fruit at this point with iodine will turn black because iodine turns black in the presence of starch. As the fruit ripens the chlorophyll in the peel breaks down, turns yellow, and the starch is converted to simple sugars.
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