How to skin tanning?
Skin tanning also has a lot of attention. Dull skin can only be considered earthy black, and shiny skin is "advanced black". Improper sun exposure can cause freckles, wrinkles, uneven skin tone, sunburn, and even skin cancer

There are two main methods of skin tanning: natural (sun tanning) and artificial (sunshine tanning).

Natural is sunshine bath.
The artificial ones are divided into sunbeds and artificial tanning. The sunbed is based on the principle of sunlight and simulates the ultraviolet radiation of the sun through artificial ultraviolet rays. The main reason for its production is that solar ultraviolet radiation has been proved by medicine to cause skin cancer. After filtering out harmful rays, artificial ultraviolet rays are much healthier than direct solar ultraviolet rays. The method of artificial tanning is achieved through artificial tanning cream or bronze sunscreen products.

According to Wikipedia, in 2007, there were more than 50000 indoor beauty stores in the United States, with an industrial value of $500million! According to the sales survey of black beauty products released by British beauty giant superdrug in 2015, British women aged 25-34 consume 1million black beauty products every year, with an average of 3 per person per year.