Surface-active agent-materials capable to mix water and oil
They exist inside our body; therefore, they are not necessary bad material.
Surface-active agent, there are two types of them.
One is natural surface-active agent,
which exists in the nature,
and the other is synthetic surface-active agent,
made by humans using petroleum as a raw material.
They are used in a lot of cosmetics and daily products,
and have a function of washing, create bubble,
emulsification, and moisturizing.
The problem is, they are very poisonous,
high in penetration, high in ability to remain.
They give a bad effect to the body and can’t break through
the process of sewage.
After this, they become the cause ocean river pollution.
It is said, there are 2,000~3,000 kinds of synthetic
surface-active agent exist.
Not only detergents, they are used also in the area of food,
medicine, and cosmetics.