Most plant hair dyes on the market claim to be pure natural, safe and harmless, and extract plant essence. Most of the ingredients are seaweed (Chinese name Impatiens, commonly known as henna). This plant dye has been recognized by FDA as a safe dark brown to reddish brown hair dye, but the effect of dyeing black is not good.
The dyeing principle of plant hair dye is direct dyeing, and the dyeing molecules are directly attached to the hair surface, which is difficult to last.
At present, the black hair dye on the market, no matter which brand, contains certain chemical components.
Any hair dye, without this chemical, is difficult to color hair. Even if it can be colored, the color is not firm, and it will fall off in a day or two.
Extended data
Matters needing attention in dyeing hair
First, don't dye it often.
Hair dyeing is to dye hair black or other colors through chemical hair dyes. In the process of dyeing hair, those hair dyes will enter the surface layer of cortex and be absorbed by scalp. These chemicals are harmful to human body.
Therefore, frequent dyeing of hair will have a great influence on hair quality. Over time, hair will turn yellow and split without luster, and even some hair dyes have not been tested for quality, containing a lot of chemical elements harmful to human health, and may even cause cancer.
It is best not to dye your hair more than twice a year.
Second, pay attention to whether the scalp is damaged.
When dyeing your hair, you must pay attention to whether there is any damage to your scalp. If there is a wound on the scalp, don't dye your hair, because the hair dye absorbed by the human body through the broken scalp at this time will have adverse consequences and be harmful to people's health.
Third, choose a hair dye with good reputation.
When you dye your hair, you must choose a hair dye with good reputation, although no matter what the price, there will be certain chemicals that will have adverse effects on the human body.
People's Network _ Is pure natural plant hair dye really harmless? Relevant experts said: At present, not yet.