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Black henna tattoos can cause severe allergies to hair and textile dyes, and there's a need for greater public awareness and regulation.

A 73-year-old man's grey-white hair turned dark brown after eczema treatment.

Depigmented hair regrowth after alopecia areata can be permanent.

Imatinib can repigment grey hair, while SU11428 can cause temporary hair depigmentation.

Segmented hair color changes can indicate active alopecia areata.

Baricitinib treatment led to dark brown hair regrowth in a red-haired woman with alopecia areata.

African hair is curled, Asian hair is thick, European hair is lighter, and chemical methods help identify hair color differences.

The modified staining method can determine the ABO blood group of hair samples accurately.

Hair color is due to active pigment cells in hair during growth.

Some patients' hair grew back black and white after chemotherapy.

UV radiation causes significant protein loss and color changes in hair, especially blond hair.

The treatment with silk proteins and linseed polysaccharides effectively protects and repairs chemically damaged hair.

Hair can naturally regain color after greying, and this change may be linked to stress levels.

Anti-PD-L1 immunotherapy can cause hair loss and unexpected hair color change, but treatment can restore hair growth and color.

Laser treatment can inhibit hair growth and different hair colors reach different temperatures when lasered.

Hair style affects perceptions of age, health, and attractiveness more than hair color does.

Some drugs can cause hair loss, excessive growth, or color changes, often reversible but sometimes permanent.

Cosmetic treatments after chlorination damage hair more than treatments before.

Photodynamic therapy can remove nonpigmented hair in mice and might work for humans.

We don't fully understand how sunlight damages different types of hair.

Bleaching damages hair, making it rougher and weaker.

Hair color affects light reflection, with black hair having higher cuticle angles and lighter hair showing less specular reflection.

Chemical treatments severely damage hair cuticles, especially in previously treated hair.

Using certain hair products may increase breast cancer risk in black women.

Hair greying is seen as a sign of aging; temporary fixes like hair dye are used, but a balanced diet and hair care can help manage it.

Hematin in shampoo helps repair and straighten damaged hair.

Gray hair affects hair's movement and appearance, making it less bouncy and more wavy.

Onion and Aloe vera can help protect hair from damage caused by hair dyes.

Chemical treatments change hair surface properties, making it more hydrophilic and able to bind conditioners.