People nowadays, regardless of men, women, old or young, are addicted to hair dyeing.
Middle-aged and elderly people like to dye their white hair black in order to look younger, but the dyeing speed often cannot keep up with the speed of graying.
Young people love to be new and original. They like to try Neptune red, granny , cherry blossom pink, haze blue... and even if it doesn't work, they will dye it linen .
But do you know? Hair dyeing is not a modern phenomenon; our ancestors have mastered this skill long ago.
1.
Hair dyeing is not fashionable among modern people. Thousands of years ago, Pharaoh Ramses I of ancient Egypt sent people to search for herbal medicines to treat diseases. As a result, his subordinates brought back many plants that could be used for dyeing.
But at that time, people rarely dyed their hair directly. Instead, they shaved their hair to make wigs, dyed them, weaved them and then wore them.
One of the henna natural dyes is still in use today. Henna tattoos, which are popular in some areas of Southeast Asia and Africa, are made of this dye.
The Romans in the first century AD preferred dark hair. They invented the world's first permanent black hair dye-lead-based hair dye, but many people died because of excessive lead content.
Hair dyeing has long existed in our country. Wang Mang, who usurped the throne at the end of the Western Han Dynasty and established the new dynasty, was the first person in China to dye hair in historical records.
In order to maintain his rule, he dyed his hair and beard black to conceal his aging image. In the "Book of Han·Biography of Wang Mang", it is recorded that he "dyed his beard and hair if he wanted to look at himself from the outside".
In addition, people in ancient times had various methods of dyeing their hair. "Compendium of Materia Medica" introduces many external medicines that can be used to dye hair. For example, barley, needle sand, gallic acid, etc. can be used to dye hair black. Eastern Jin medical scientist Ge Hong recorded in " Elbow Emergency Recipe " that boiled soybeans in vinegar slurry were used to dye hair, but the problem of "easy discoloration" has always existed.
In 1863, British chemist William Henry Perkin accidentally created aniline violet synthetic dye while researching drugs to treat malaria. This was the first synthetic dye and the beginning of modern hair dye .
In 1907, French chemist Eugene Schuyler created the first commercial hair dye, which was very popular at the time. To this end, he founded a company to develop and sell hair dye products, which is now L'Oreal .
Eugene Schuyler
2.
It’s true that you love beauty, but can you afford the price?
Driven by the market, more and more hair dyes are being produced. While hair dyes make people beautiful, they also secretly pose health risks.
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Can hair dye cause cancer?
At present, most of the chemical hair dyes used on the market are chemical hair dyes, and chemical hair dyes contain a chemical substance called p-phenylenediamine . It is favored by manufacturers because of its strong and long-lasting coloring.
In the list of carcinogens published by the World Health Organization's International Agency for Research on Cancer in 2017, p-phenylenediamine belongs to Category 3 carcinogens (3 carcinogens means that its carcinogenicity to humans is doubtful ) .
In 2020, Harvard Medical School and other institutions published an article on permanent hair dye in the well-known journal " British Medical Journal ". They conducted a 36-year survey and follow-up of 117,000 female nurses, analyzed the data, and finally concluded:
Individual use of permanent hair dye has no significant correlation with the incidence of most cancers and the risk of cancer death.However, it is associated with an increased risk of basal cell carcinoma , some breast cancer and ovarian cancer.
In other words, occasional hair dyeing will not cause cancer, but frequent hair dyeing does not rule out the possibility of increasing the risk of cancer, so it is recommended to dye your hair up to 2-3 times a year.
2
The price of beauty, there may be these risks
Although the chance of hair dyeing causing cancer is very low, it does not mean that it is safe. Blindly coveting beauty may bring these harms.
- Liver and kidney damage
Previous news reported that a 50-year-old woman in Hebei dyed her hair twice a month and suddenly felt a loss of appetite and fatigue. As a result, she went to the hospital and was diagnosed with drug-induced hepatitis.
This is because some inferior hair dyes contain heavy metals such as lead, mercury, arsenic and other toxic chemicals.
If used frequently, the toxic substance lead will enter the human body through the scalp and cause chronic damage to the body. People may have symptoms of lead poisoning such as dizziness, numbness of limbs, and abdominal pain, and these substances can also damage organs such as the liver and kidneys. Function.
- aggravated hair loss
The main component of hair is keratin. The hands that hold keratin together are called disulfide bonds , and disulfide bonds are very sensitive to oxidants and reducing agents in hair dyes.
When bleaching hair, disulfide bonds will be destroyed and keratin will also be lost. This can lead to cracks, dryness, split ends, and even hair loss in the hair surface.
You after bleaching your hair
- Skin allergies
P-phenylenediamine is a strong allergen. 5% of people who dye their hair will experience allergic reactions of varying degrees, such as erythema, itching, desquamation and even edema.
3.
How to reduce the damage of hair dyeing?
Even after what the editor has said, there are probably still people who can’t resist the temptation to dye their hair. If you really can't control your restless heart, then you must remember the following two things.
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It is best not for these five types of people to dye their hair
Some people have buff blessings and can switch hair colors at will, but these five types of people should not follow the trend.
2
If you can’t help it, then minimize the risk
If you must dye it When it comes to hair, you should keep these three steps in mind:
① Do a sensitivity test before dyeing your hair
Do a sensitivity test : 48 hours before dyeing your hair, you can apply a little hair dye on the earlobe or the inside of your elbow. If there is no redness, swelling, heat or pain, go to the hair again.
Try not to wash your hair before dyeing it : The oil secreted on the scalp and the keratin metabolized can play a certain protective role, so it is best to wait until your hair is oily before dyeing your hair.
Go to a regular store to buy/dye your hair : Do it yourself, go to a regular store to buy products with "National Cosmetic Approval". If you go to a barber shop to get dyed, choose a regular shop and check the product packaging.
Choose hair dye carefully : Try to choose temporary hair dyeing and semi-permanent hair dyeing methods with shorter duration to reduce the concentration of chemical substances in the hair dye.
Temporary hair dye
If you want to choose a permanent hair dye, natural hair dye is the first choice. If you want long-lasting dyeing, use synthetic hair dye, and dye it no more than 2-3 times a year, otherwise it will easily harm your body.
Protective measures must be taken : earmuffs and shawls can be arranged, otherwise it will be difficult to wash off if it gets on the skin, and there may be a stinging sensation.
② When dyeing your hair
try to dye your hair as dark as possible. The more colorful it is, the more harmful it will be to your health : The heavier the color of the hair dye, the more heavy metals and chemicals it may contain. It is recommended that you dye your hair as dark as possible if you can, and try not to bleach your hair if you can. drift.It is best not to do
perming and dyeing at the same time as : perming and dyeing will cause 1+1>2 damage.
Avoid using multiple brands of hair dyes : Using different brands of hair dyes at the same time may cause chemical reactions, so mixing them is not recommended.
③ After dyeing your hair
wash your hair with fingertips to avoid scratching : Washing your hair with fingertips can avoid scratching your scalp, which may cause hair dye to irritate the wound.
If you find that your skin is itchy and swollen, and there is an increase in dandruff, do not blindly use anti-dandruff shampoo . It is best to choose mild shampoo and conditioner. If the situation worsens, be sure to go to the dermatology department of the hospital for a checkup.
Finally, I would like to remind those friends who already have thin hair, never get permed or dyed hair. Hair volume is not rich in the first place, and repeated tossing will only make the hair wither. Especially for male friends, we just need to stay present.
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