We use different kinds of soap , different colour soaps. Yet whenever we wash, we get only colourless foams or lather. Why is that the lather is not coloured?
when soap is mixed with water and lathered, it mixes air and forms bubbles. This we call foam. These bubbles have more air inside than the soap material. Also colour of natural light is white. This reflection of light in soap produces white foams instead of coloured foams. If we use coloured light and see these foams , the foams may appear coloured since they reflect coloured light.
Thus a thin film of bubble has lots of air and because of low surface tension this thin film forms many small bubbles - large surface area! When light strikes these innumerable bubbles it gets scattered.
So all foams are white in colour.
when soap is mixed with water and lathered, it mixes air and forms bubbles. This we call foam. These bubbles have more air inside than the soap material. Also colour of natural light is white. This reflection of light in soap produces white foams instead of coloured foams. If we use coloured light and see these foams , the foams may appear coloured since they reflect coloured light.
Thus a thin film of bubble has lots of air and because of low surface tension this thin film forms many small bubbles - large surface area! When light strikes these innumerable bubbles it gets scattered.
So all foams are white in colour.
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