Re: Corrosion of A and E strings
Looking at the enlarged photo.,i notice quite a bit of 'crud' sticking to the underside of the strings in the area that you mention,so what make of strings & picks are you using, & is the pick showing any signs of wear ?. If the corrosion was caused by anything 'atmospheric',i'd expect it to affect the whole string length,so it's something 'local' to that area. I've never heard of strings especially the stainless steel ones used for instrument strings, being adversely affected by pick material.
I know that some of the old style Gibson scratch plates were made of a material that ''gassed out'' due to deterioration over time,so could the scratchplate be made from a similar material on your Gibson which is causing the problem ?. I somehow doubt it,but it's the only other thing 'local' to the corrosion area that i can think of - although ?.
Does that part of the string length actually touch the inside of the case ?. If it does,could the adhesive used to fix the lining material be having an adverse effect on the strings / frets just in that area ?. Maybe try leaving the mandolin out of the case for a few days the next time you re-string & see what happens - very puzzling !!,
Ivan
Weber F-5 'Fern'.
Lebeda F-5 "Special".
Stelling Bellflower BANJO
Tokai - 'Tele-alike'.
Ellis DeLuxe "A" style.
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