I color my hair for the fun of it. In recent years, I have tried to go progressively darker, and this last batch of color was a true brunette shade.
Unfortunately, regardless of the color used everything fades to blonde. I suspect that if I went true blue-black, in two weeks some golden highlights would shine through.
I noticed that the same is true with my personality. I have been professional and authoritative, and then sometimes my slip shows. I make the most god-awful stupid remark and am blonde all over again.
I have decided to accept this, categorizing this tendency as one of my quirky charms.