come to think of it, i'm not sure if the vinegar trick will work on my rosewood fretboard.
that's why i rather use something like the "black fingerboard stain" from StewMac's, but unfortunately they're not allowed to ship it to Canada.
the aniline dye could be an option too, but i don't know where to get some, or whether or not its safe to have on a fingerboard, like.. it is toxic, harmful or pathogenic in anyway? cus you know, you're gonna be in contact with it quite often (fingerboard + fingers)
any suggestions, people?