Can expired soap still be used

Soap is a common daily necessity in our daily life. Soap can also be used to wash clothes. It works quite well when used to wash clothes. If children's clothes often have stains, then you can choose soap to wash them. The washing effect is very good. However, if you use expired soap, you will be very worried about what harm it will do to your life. So, can expired soap be used?

If the appearance and smell of soap have not changed significantly after its shelf life, you can continue to use it, but the effect will be less effective. If the soap has become sour, it is better not to use it.

Under normal storage conditions, the shelf life of soap is generally three years. As soap is stored for a long time, its weight will become lighter, its transparency will improve, and its hardness will increase. Generally speaking, long storage time has no obvious effect on the washing effect and it can continue to be used.

However, soap that has exceeded its shelf life is at risk of becoming rancid (commonly known as "deterioration"). In mild cases, yellow and black spots will appear on the surface of the soap, while in severe cases, oily sweat will appear. The detergency of rancid soap will decrease with the degree of rancidity. The reason for rancidity is that, on the one hand, the mixed fatty acids in soap contain a certain amount of unsaturated fatty acids, which are oxidized after long-term contact with air; on the other hand, the unsaponifiable matter contained in soap will decompose into fatty acids and glycerol after long-term contact with air and sunlight, causing the soap to become rancid. The resulting substances have an unpleasant odor.

Expired soap is for use, not for eating, so it can be used even after it expires. However, expired soap may not be as effective as before. If you are worried, you can buy other soap to wash your clothes. This way the clothes will be cleaner. When washing with expired soap, you should also check whether there is foam. If there is, you can continue to use it.