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Colour of lather?

  1. Sep 13, 2011 #1
    Dear members,
    Soaps and Shampoos comes in various colours, but their lather always appear white. What is the reason for this phenomenon?
  2. jcsd
  3. Sep 14, 2011 #2


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    Think foam and light scattering. Note that salt and sugar are transparent, but also appear white when small particles are viewed [/i]en masse[/i].
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