Actually, to achieve that bright yellow color,Fender bleached the alder, neutralized it with vinegar, stained yellow, then sealed with Fullerplast. Often times dried up pools of bleach in the routes are confused as being buffing compound (although there was some compound there as well). The bleach was used to even out the color between the different pieces of alder used in the body. The bleach was used from the start of alder bodies around late '56 and lasted until 1964. At that time the factory began spraying the bodies with a yellow finish that was semi-opaque like blonde to hide seams and mineral stains. These created the "target" burst look.