Specialized laundry soap should not be used for bathing, while regular soap can be used for bathing. This is because specialized laundry soap is alkaline and may cause irritation and dryness to localized skin when used for bathing, which might feel uncomfortable. Therefore, it's preferable not to use soap for bathing; other bathing cleansers can be used to remove stains from the body.
Differences Between Soap and Bar Soap
Different Ingredients: Regular soap usually lacks beneficial ingredients for the skin, whereas bar soap contains beneficial components for the skin.
Different Uses: Soap is used for laundry, while bar soap is used for cleansing the skin.
Different Properties: Soap is more alkaline compared to bar soap, which has lower alkalinity.
Main Ingredients of Soap and Bar Soap
Soap
The primary component of soap is metal salts of fatty acids, acting as a surfactant to emulsify oil stains into droplets suspended in water. Additionally, it contains fillers such as sodium silicate, providing hardness and smoothness to the soap. Soap-making processes are relatively simple. From a cleansing perspective, soap is stronger than bar soap but is much more irritating. Hence, soap is mainly used for cleaning shoes and clothes.
Bar Soap
Bar soap consists of fats, oils (mainly plant oils), and salts, forming an alkaline salt with a pH of 9.5-10. It contains anionic surfactants on its surface, emulsifying surface substances of the skin to remove dirt. Bar soap production is more complex. Compared to soap, it is less alkaline, has a higher fat content, and is less irritating to the skin. Typically, bar soap is used for washing the face, body, and hands, suitable for skin cleansing.
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