There's a lot of ways to go but I'd personally start with yellow, red and brown mixed up from LMII dry powders. It takes only a tiny bit of darker dye to change the mix of a light color dramatically. (5%, 10%?) You'll want to make up test batches and daub them on some light wood, pine oughta work if it's sanded to new, whitish wood. OF COURSE it would be best to run your test batches on AAA grade quilt maple... but that's not going to happen. With water-based dyes, you can usually rinse it lighter, or you can bleach it and start over if you blow it completely. OF COURSE MEK-based dyes are more intense.... sigh. I think maybe you can bleach and start over MEK dyes with... some kind of solvent?
It will be easiest to make your test mixes measuring with a graduated syringe (no needle needed), or at least a graduated eyedropper. WRITE DOWN your ratios. Or you'll end up with a half-dozen little bottles of various blends and you can't remember shit.
IT RARELY PAYS OFF TO KEEP POURING MORE LIGHT COLOR INTO A DARK BATCH TO "SAVE" IT! You can use a too-brown "yellow" as your new "brown" to darken more new "yellow", but there you're quickly heading down the slope where you can't remember shit.... dyes are pretty cheap, compared to spending the rest of your life staring at a guitar you hate because you blew it. Dye the cat! Dye your sheets! Dye... something.....
Dan Erlewine's recipe for "Vintage Amber" is:
8 parts yellow
2 parts brown
1 part red
- but it doesn't say how dark each one is to start with.... might make a difference, hmmm. :blob7: