When you shampoo your hair, then rinse, then shampoo again, there is always much more lather on the second shampooing. Is there a scientific explanation for this?

myrab51

The oils in your hair reduce the amount of lather created. The first shampooing removes much of the oil therefore producing a greater amount of lather on the second shampoo. Jun 12 07, 10:15 AM

billythebrit

Thank you EVER so much! I've always wondered why. So I guess when they say 'Shampoo, rinse and repeat', there's a reason behind it. Thanks!!! Jun 12 07, 1:10 PM

robboy

That depends on what 'reason behind it' you're picturing, billy. Repeat usage will naturally produce more lather and foam, because the bulk of the work was done on the first go-round. Personally, I've always felt that this 'rinse and repeat' business is more accurately about using more of their product, and I'll bet I'm not alone. Miss Peasy is a resident expert at this and may wish to weigh in on the particulars, but I understand she's quite busy right now. * http://www.geocities.com/hotsprings/4266/shampoo.html Jun 12 07, 1:26 PM

satguru

I tested this after a doctor claimed only one wash was required. My hair needed washing twice as frequently when I did this and was back to normal on two applications. It wouldn't surprise me if people use too much shampoo each time though as the first go you don't need a lot of foam for it to work. Jun 12 07, 5:45 PM

MonkeyOnALeash

Wash once and feel your hair. REALLY feel your hair. Wash again and feel your hair. The answer is abundantly obvious. Twice is more effective than once. One MUST condition upon cleansing the hair so thoroughly. Oil is necessary for hair consistency. Jun 12 07, 7:33 PM