After you etch and neutralize if you will take sandpaper and lightly sand, this will highlight areas. Do this sanding with whatever the finest grade was that you used when you did the sanding prior to etching. This is when it makes everything stand out. You can also use a hair drier on the blade after neutralizing to "set" the black color, once dried you can then spray it down with WD-40 or any light weight oil. Some of the black is going to come off no matter what you do. I mainly work with cable, therefore the etch I do is deep enough to create raised areas, this light sanding really stands out on a deep etch. Good Luck