Re: Staining New Tuner Buttons
To add to the good info on using tea...I experimented with this a couple years ago when I made a set of bone buttons for my mandolin. I made a strong cup of Earl Grey tea, and set some bone pieces in it for varying periods of time to see how the color would be and how deep the tea penetrated depending on soak time. The color came out to be an attractive shade of brown. If you have bone buttons this procedure may give you what you want, but I'd practice on some scrap pieces before you did the real ones.
2003 Washburn M6SW