The mystery of Dr. Seuss’s green eggs and ham has now been debunked. The eggs weren’t rotten or coloured with food colouring; they just contained red cabbage juice. The pigment in red cabbage, an anthocyanin, has long been used as a simple pH detector much like litmus paper. Egg whites have a pH of around 9-10 and therefore change the color of the cabbage juice to green. Check out the video below of this being done.
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