Soaps come in different colours. But why is soap’s lather always white in colour?

Question: Soaps come in different colours. But why is soap's lather always white in colour?
- Keywords:
  colour,
  lather,
  soap
Asked by alysha to Hitesh, Hywel, Mae, Nik, Tiffany on 13 Jun 2012.
- Tiffany Taylor answered on 13 Jun 2012:
  
  I had to look this one up. But apparently, it’s because the dye in the soap which makes it a certain colour sticks to the water not the surface of the bubble, so the dye will sink to the bottom of the bubble, and the majority of the bubble looks white.
- Nicola Ibberson answered on 14 Jun 2012:
  
  What a great question! I’m quite glad I now know the answer to this!

Question: Soaps come in different colours. But why is soap's lather always white in colour?