When I’m in the shower, sometimes I’ll notice my hair is particularly greasy and once I’ve rinsed off the first round of shampoo, I’ll apply a second round. And no matter how small of an amount I apply the second time around, it turns into a baby bubble bath commercial with oodles of suds and bubbles and foam all over the place?
Is it because the first lot got used up on a larger bulk of grease and the second amount doesn’t and so it can bubble up more?
In: Chemistry
Yes it’s what you said. Soap binds to dirt and grease. Free unused soap makes bubbles. Soap particles that have grabbed a piece of dirt or grease can’t participate in bubble making.
On the first wash most of the soap gets used up removing the grease, so it’s bound up and can’t foam. If you shampoo again there’s less grease to bind up the soap, so it can foam more.
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