Generally speaking, the recipe for black tea color includes gross tea, water, mycorrhizal species and charcoal, of which gross tea is the main ingredient, water is used to humidify the gross tea and promote microbial fermentation, mycorrhizal species are the fungi and bacteria that grow and multiply on the gross tea, and charcoal is used to regulate the temperature and humidity to maintain a stable environment inside the kiln.1 The recipe for dyeing black tea-colored hair can be adjusted according to the texture of the hair, the hair color, and the temperature, and the common recipes are 5 /77, 611, 011, 0/88, 4/0, 6.77+6.11+6.2+9, etc. 2. In addition, certain ingredients in the formula can be increased or decreased by oneself according to different skin colors to achieve different texture effects.3 Generally speaking, the formula for black tea coloring consists of gross tea, water, fungus strain and charcoal, of which gross tea is the main ingredient, and water is used to moisten the gross tea and to promote microbial fermentation. Fungus strains are fungi and bacteria that grow and multiply on the hair tea, while charcoal is used to regulate the temperature and humidity and maintain a stable environment in the kiln. The formula for dyeing black tea-colored hair can be adjusted according to the hair texture, hair color, and temperature. Common formulas include 5/77, 611, 011, 0/88, 4/0, 6.77+6.11+6.2+9, and so on. In addition, it is also possible to increase or decrease certain ingredients in the formula on your own to achieve different textural effects depending on your skin color. Black Teal formulas are usually based on a mix of red and green. Here are some commonly used dark teal formulas:

1. Red + yellow-green + purple = dark black

2. Red + green + yellow = dark brown

3. Green + crimson + brown = green-black

4. Red + purple + green = dark wine color

5. Indigo + yellow + red = dark gray-brown