bodia
Authorities said.....best leave it.....unsolved
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Maybe @docteurseb could answer some of your hypotheticals.....That's a good question, although is it true that no other manufacturer has ever had problems with any kind of color fade? That's a very broad brush to paint/stain with.
I have a few blue or partial blue PRSi, and fortunately have not yet encountered any issues with fading. I keep them hung on walls, but those walls are in a hallway with no direct sun, and very low ambient light. We don't keep the lights on very much in that hallway. So perhaps I have just the right set of environmental circumstances.
But back to the guitars that do fade: it appears PRS has had some inconsistent batches/types of blue stain over the years. Is anyone savvy enough about the available stains on the market that PRS could possibly select from, and offer some insight as to whether there is any single root cause to the issue? i.e. (making this up) all dyes made from "Blue Cobalt BR594" never fade but due to inorganic nature tends to cover up the finer details of the wood grain, but dyes made from "Blue Steel Zoolander 92" are good for wood grain but tend to fade because they are derived from the dead skin cells of Smurfs?
i.e. my Sapphire Blue McSoapy looks just as vibrant as anything else I could imagine in that dark blue stain, my SAS in Blue Matteo is still stridently blue. Why hasn't PRS simply used those dyes all along - why experiment with new dyes and seemingly not bother to find out if they are subject to fading?
Or is it a combo of the dye used and the finish put on top? Maybe some finishes contain some sort of "stabilizer" or "magic light blocker" that help keep the stain looking new, but others can cause the stain to fade when exposed to "too much light"?
So dye #123 that worked great for years is suddenly prone to fading because PRS switched to V12 for the finish. After switching away from V12 to Poly-whatever magic finish, it became stable again (unless abused by lots of sunlight).