Put a paper clip (the black triangular heavy duty ones) on an unused corner, tied a string
to it and attached it to the pen. Then submerged the board in etchant in a tupperware
sandwich container ('won't be eating from that anymore). It was too big a container for
the board (waste of etchant) that I was doing.

I was doing all this outside, and it was cold yesterday, so the first 10 minutes went
slowly without much etching going on. Then we brought out a hair dryer to heat the
etchant and keep it agitated (twirling the board around in cold etchant gets tedious).

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