DIY gray hair dye

This is Lien's Black Hair Secret.

I am finding it very convenient for dyeing my gray hair at home. First of all, it is convenient because it is individually packaged in sets of three. You just need to adjust the amount of dye with the included brush and comb it through, and you're done. You don't need to prepare things like plastic gloves separately. Another advantage is that it doesn't sting the eyes or have a strong smell.