I need some of the etched brass parts to assemble the rear axle assembly. I decided to blacken the whole sheet instead of the just the parts as needed for each assembly . This  is also the safest way to store them till needed. I searched the forum for blackening tips and after reading up,went with the following.  I started by carefully by sanding the front and rear surfaces with 1500 grit paper.My wife donated an old 8" x 8" baking pan. Using latex gloves,I filled this with enough acetone to jus