diy pcb making problem (acid + oxygenated water)

Werner Almesberger werner at
Thu Aug 27 15:28:12 UTC 2015

Rafael Ignacio Zurita wrote:
> What I am seeing is that the toner is removed when I am trying to
> remove the copper with acid. Then, the board left ruin :(

Interesting effect :-) How long did you etch until you got
this ?


The solution looks very green. Maybe add a bit of 30% peroxide
until the color gets more blueish. You also seem to have a lot of
etching solution. You only need enough to submerge the board.

If you use a hermetically sealable container, you can reuse the
solution. If it gets stale, you can refresh it by adding a bit of
HCl and peroxide.

- Werner

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