noun
dyeing one's own hair; at-home hair coloring
Wasei-eigo from English 'self colour'. Refers to the act of coloring one's hair by oneself, typically with a box dye kit, as opposed to having it done at a salon.
wasei-eigo (Japanese-coined English), from self colour
最近はセルフカラーで髪を染める人が増えている。
Recently, more people are dyeing their hair with at-home color.
セルフカラーはサロンより安いけど、ムラになりやすい。
At-home hair coloring is cheaper than a salon, but it's easy to end up with uneven color.