For clarification , some points must be indicated. I am running two threads , here and Leica Forum and an heavy cannon as a moderator there confirmed that nickel interlayer between copper on brass and top chromium electro platings effects the chromes color and appereance.

Is there anyway to measure each one of three layers thickness at a lab with sacrifying an lens cap ? How a lab person could to this , straching the cap and measuring the layers with an electron microscope ?

Without going expenses , do anybody knows copper , nickel , chrome layers thicknesses in micron ?