Just a reminder that shoe dye (leather dye) is alcohol based, just as
shellac is. That means you can use the bazillion colors of shoe dye made
for the leather industry to match what you need. If you lay down thin
layers of colored shellac, you can darken to get the right shade.
If you make a nasty mistake with the color, you can easily wipe most of the
color away by wiping with a damp alcohol cloth, so it’s somewhat
reversible. I use Fiebing’s dye. About one to two drops of dye per shot
glass of shellac is where to start.