I'm a sucker for novelty flavors - particularly novelty flavors of Oreos.
So I bought the Doctor Doom, color-changing Oreos and didn't notice any color change happening.
Admittedly, I wasn't dunking the cookies in milk. I was just eating them and noticed maybe a slight greenness to my teeth and tongue, but the green was dominated by the standard brown of Oreo crumbs and the dark brown, 'toasted marshmallow' cream.
So I went hunting and found that the color change is accomplished by encapsulated dye within water-soluble capsules. When the capsules come into contact with water (or milk which is, of course, water-based), the capsules release their dye.
Thankfully the cream is primarily oil-based, so the capsule don't dissolve until they're in milk...or water...or saliva.
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