A preliminary test is essential to be conducted for the first time to determine whether or not any sensitivity to the Black Henna dye exists.
For carrying out the test, make a small sample of Black Henna paste as described above. Then, cleanse a small area of the skin behind the ear or on the inner side of the forearm using soap and water.
Apply the sample as prepared to the area and allow it to dry. After 24 hours, if no irritation or inflammation occurs, it may be assumed that no hypersensitivity to the dye exists.
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