Is it true or false that sulfur soap has no foam? Why does the soap produce less foam the more you use it?

When using sulfur soap for cleaning, first rub the sulfur soap until foam is produced, and then scrub your face or body. This can reduce the irritation of the sulfur component to the skin. So, is it true or false that sulfur soap does not foam?

Is it true or false that sulfur soap has no foam?

uncertain. Sulfur soap is harder than other soaps. It still produces foam, but less. Using a foaming net can produce more foam. However, if the soap becomes smaller and thinner as it is used, it will not lather well. Also, if it has been used and left there for a long time without being used, it may have gone bad.

Why does soap produce less foam the more you use it?

When soap is first produced, its alkalinity and foam are uniform. During transportation and waiting for sale, its alkalinity will evaporate to the surface. Especially when it is used, the alkalinity will evaporate to the surface when the soap comes into contact with water, and you will feel that it foams easily. As the soap becomes smaller and thinner as it is used, it will not foam much.

Soaps with more foam clean better

The contribution of lather to the cleaning power of soap is insignificant and there is no evidence that non-lathering products are less effective than lathering products. The main ingredient of soap is higher fatty acid salt, which is one of the common surfactants. Since surfactants can both remove stains and produce foam, the traditional concept links the cleaning power of a product with foam, mistakenly believing that the more foam, the stronger the cleaning power.

In fact, cleaning power is mainly related to the type and characteristics of surfactants, and has no direct connection with foam. Foam is water-based and is produced by stirring and friction during use. The degree of stirring can control the amount of foam. The amount of foam does not indicate the quality of the washing effect. For example, the foaming performance of nonionic surfactants is far inferior to that of higher fatty acid salts, but their detergency ability is much better than that of higher fatty acid salts.