You can but it's not very affective. I got it for my dad. Works great on his hair, but won't take well to the side burns which are a lot coarser, it looks good though as these parts go white first anyway. I bought him a beard and moustach dye for his eyebrows, as the grecian doesan't take well to these either. But with the beard and moustach dye, you can mix smaller amounts at a time.