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Scour the boards with a Scotch-brite pad then rinse with acetone. Notice the fingerprints on
the board which has not been scoured yet.
Use an iron (no steam!) on the hottest setting to iron the pattern onto the copper surface. Press down hard for about 3 min.
Another option is to iron the pattern onto the board rolling on a dowel – easier to apply more pressure to every point on the board.
After soaking, remove as much backing paper as possible with the fingers. The ink
pattern will stick to the copper below.
After cleaning off as much paper as
possible by hand, use a toothbrush to
scrub the surface some more. The ink should not come off
the copper at all during this process.
Here is a set of boards, ready for etching. The ink serves as a “etch mask” to protect
the copper when it is submerged in etchant.
Etching is done with a solution that is two parts hydrogen peroxide to one part muriatic
acid. Acetone is used for clean-up.
When immersed in etchant for a few minutes the exposed copper is dissolved. This board is
not quite done near the bottom edge.
Continuously agitate the solution while etching, always wearing gloves. The etch
solution turns greens from the copper.
Here is a fully-etched board, ready for clean up. The plastic under where there
used to be copper is actually white.
Use acetone to wash off the ink etch mask. At right is a set of finished boards, all of which have been etched (because the plastic looks
white) but only 3 of which have been cleaned.