Sun will bleach color slowly over time but you can't leave a guitar in direct sunlight because it will heat up and damage a lot of your glue joints.
Impossible if you ask me.How can you lighten a dark brown finish safely?
No Tom, the grain filler is already heavily stained! So the bare wood is colored, not only the lacquer! Go to minute 26:00 and watch until 28:13 and you will see what I mean, here it is a rosewood guitar but it is the same for a mahogany guitar.I'll assume it's all mahogany, but either way, the only way they get the BR (brown color) is by staining the lacquer. So you'd have to strip the guitar and refinish it.
Actually, if you get a tanning bulb and build a light box, that might just do it.
didnt michael jackson do it?
Well I guess it will continue to lighten over time. I’m not getting a tanning bed, tanning bed light, or leaving it in the sun. I would consider trying a UV bulb, if there was some indication that might help. It just needs a little help. The grain is just short of right there.
Impossible if you ask me.
No Tom, the grain filler is already heavily stained! So the bare wood is colored, not only the lacquer! Go to minute 26:00 and watch until 28:13 and you will see what I mean, here it is a rosewood guitar but it is the same for a mahogany guitar.
https://youtu.be/UVVTSuC-01k?t=26m00s
Ralf
Think of it as a bikini line.For you see, the chair I leaned it against shaded the lower bout from the sun... so the upper bout is a pretty, golden mahogany color, while the lower bout still has the deep, port-wine color of Guilds stain.