Another way to get a "black" fill on your etched design, is to go from a DC voltage to an AC voltage.
Etch normally for however long it takes for your normal etch, then, leaving the electrode/anode in place, attach the leads to an Alternating Current supply of the same voltage -NOT YOUR HOME AC LINE!-
For example, if you're etching with a 5 volt DC supply, when you're done etching and you want to "blacken" the etched lines, leave everything as is, except now attach your leads to a 5 volt AC supply for about one minute.
This is what an "Electro-Etch" unit does to blacken the etched design after etching. Do a Google search on "Electro-Etch" for more info.
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