How come you can buy shower gel and shampoos in all different colours but it always lathers up white ?

This is physics rather than anything to do with skin and body. Light is reflected at both the front and the back surfaces of a soap film. Depending on the thickness of the film, the light waves reflected from the two surfaces will reinforce each other for some colours but cancel each other out for others (this is known as thin-film interference). If you look at a bubble closely you will see bands of different colours, since the bubble will be thinner at the top than at the bottom. This means that bubbles are reflecting all the colours of the spectrum and white light is made up of all these colours. That is why soap suds appear white.How come you can buy shower gel and shampoos in all different colours but it always lathers up white ?
I love these questions.


but I use johnsons strawberry bubble bath for my little girl, that lathers up pink and smells yummy.How come you can buy shower gel and shampoos in all different colours but it always lathers up white ?
because when the bubbles emerge they are translucent (clear) and are small spheres. The light hitting them gets dispersed into all colors and all colors together in light is white. So the bubbles reflect on each other and the collective foam looks white.
honestly don't know that answer but its magic.
Star. Have no idea and it is such an intelligent question, so star.


I only know that NASA invented gel (like you use for shaving) but didn't have any use! So we use it for bathroom stuff.


Not sure how true it is, but I believed it.


Your question though-all fizzy drinks go white when they fizz up?
I've never really thought of this, so I'm glad you asked. I learnt something...Here's what I found-





Why are soap suds always white even when the soap itself isn't?











Answer


Because soap when sudded out into bubbles is so thin at that point that it is not concentrated enough to have color, its mostly water.





But although it does not have color, it is still not transparent! That is because of light scattering. Note that you can also see the colors of the rainbow in larger bubbles due to interference patterns which form in thin films.