Background The appearance of grey hair can be unwelcome at any age and have far-reaching implications. Canities can impact self-esteem, and result in the application of harmful products. In Unani medicine Coffea arabica is said to stain hair dark brown and mask all grey, but no research investigating these claims was found.
Objective A preliminary exploration to test the efficacy of coffee to stain hair dark brown, and mask all grey, and to evaluate its feasibility and acceptability.
Materials and methods A concentrated solution of instant coffee (100% Arabica) was applied externally to hair up to once a day over 7 months. This autobiographical pre-pilot study (n=2; ages 54 and 57) was evaluated using the Feasibility, Reach-out, Acceptability, Maintenance, Efficacy, Implementation, Tailorability (FRAME-IT) framework.
Results A coffee colour tone was apparent, but coverage was only partial. Individual hairs ranged from dark brown to light brown to grey. The overall effect was darker. Coffee solution, applied to hair as a wash and spray, was feasible, acceptable, and effective in visually reducing greyness for a nuanced and natural look. Additional benefits to hair, and also to scalp and skin conditions were observed.
Conclusion Coffee did not uniformly stain hair dark brown; its effect on grey was nuanced. Participants found it to be a low-risk, inexpensive, convenient alternative, and appreciated the nuanced look. A pilot study and testing in wider populations with different levels of greyness is recommended as is the identification of a low-risk mordant to address colour permanency.