'Lather or foam is nothing but a large collection of small soap bubbles. A soap bubble is , in turn, a very thin film of soap solution enclosing some air. Because of the low surface tension of soap solution, the film can stretch and spread and form innumerable bubbles with a very large total surface area.

Due to this, whatever slight tint is present in the thin film of the coloured soap solution gets subdued. Although a soap film is more or less transparent, the lather or foam looks white because the light striking this large collection of bubbles gets scattered. That is the reason why all kinds of lather or foam appear white.'

No substance has its own color. We perceive color only when the white light, composed of different wavelengths is absorbed, reflected or scattered on their way to our eyes. For example, if a board of laminate appears red, it means that it absorbs all the colors of spectrum except red and reflects only red.

Foam of soap (also called lather of soap) is a large bunch of bubbles which are made of very thin film of soap solution plus some air. Bubbles allow some light to pass though them and scatter the rest. If no specific color is reflected, we consider this state of colorlessness as white.

No substance has its own color. We perceive color only when the white light, composed of different wavelengths is absorbed, reflected or scattered on their way to our eyes. For example, if a board of laminate appears red, it means that it absorbs all the colors of spectrum except red and reflects only red.

Foam of soap (also called lather of soap) is a large bunch of bubbles which are made of very thin film of soap solution plus some air. Bubbles allow some light to pass though them and scatter the rest. If no specific color is reflected, we consider this state of colorlessness as white.

Lather or foam is nothing but a large collection of small soap bubbles. A soap bubble is , in turn, a very thin film of soap solution enclosing some air. Because of the low surface tension of soap solution, the film can stretch and spread and form innumerable bubbles with a very large total surface area.

Due to this, whatever slight tint is present in the thin film of the coloured soap solution gets subdued. Although a soap film is more or less transparent, the lather or foam looks white because the light striking this large collection of bubbles gets scattered. That is the reason why all kinds of lather or foam appear white.