With a clever bit of kitchen chemistry you can easily make your own green eggs, without any food colouring! The secret lies in a special pigment found in ordinary red cabbage, when cabbage juice is introduced to the alkaline egg whites the change in the pH causes the purple juice to turn a greenish-blue colour, it's completely harmless and produces a neat effect.
So for all you Dr.Seuss fans out there, get ready to have your favourite childhood story for breakfast.
Enough talk, let's make some green eggs (and ham), Sam I am!
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Btw. here is a cool picture:
The acidity may vary due to soil, but that's not really what this Instructable is all about. I'd be happy to edit any part of the science written here if you can clearly elaborate on exactly where I strayed.
"The purple pigment in red cabbage is called anthocyanins and can change colour in response to changes in pH. The acidity in red cabbage causes the pigmentation to be purplish, but when introduced to an alkaline condition (like the whites of eggs) changes to a blueish-green."
I would write:
"Naturally red cabbage has a colour somewhere between red and purple, depending on the pH-value of the soil it is growing in. This colour change occurs due to the pigment flavin, which belongs to a group of water soluble plant pigments called anthocyanins (For those of you, that don't know what the pH value refers to, it is the measure of the acidity (pH < 7) or basicity (pH > 7) of an aqueous solution).
In this Instructable, we are making use of the fact, that flavin is a natural pH indicator and that egg white has a pH value of about 8. These slightly alkaline condition result in a colour change to a blueish-green."
Hope I could help
Heh, good job. :)
Sunshiine