Of course, you can dye human hair extension, but after dyeing, the hair quality will slowly deteriorate with time.
★Hair bought from selling your hair for money.
In some underdeveloped areas, they sell their hair in exchange for living expenses, but manufacturers will bid based on the quality of their hair. Generally Indian, Brazilian, Peru, and Malaysian hair are the most common, and they are considered the most valuable because of their quality and untreated nature.
★Hair waste, collected from the salon.
Most people trim their hair in the salon, but they do not take it away. Some salon stores will collect the hair and process it twice, but the economic value is low because it is not reduced in order or was hot and dyed before.