Single white eyebrow hairs
Do not pluck a few white eyebrow hairs, just dab a bit of brown mascara over it.
If you are not quite young, you will often see white eyebrow hairs. I recommend you not to follow the first impulse and pluck it out with the tweezers.
Because rarely you just caught this hair - and the resulting small gap looks ugly.
Just take a brown mascara, as waterproof as possible - if you get into the rain - and shower the white hair. Nobody notices and the white is temporarily gone.