The simplest etchant tank is a tall plastic food container that stands in
a shallower one. The tall tank is filled to 2/3 with FeCl3 etching
solution and with a half dozen pebbles (to prevent it from floating) and
the outer shallow one is filled as high as you dare with water from a
kettle. If you use the lid on the etchant tank it will keep for 2 years or
more, in despite of what others say. You don't really need bubbles for a
start, just more time and move the board in the etchant from time to time.
I use a phonebook as insulation under the shallow container, it keeps the
water hot longer.

This is the starting point. I am sure the list will have contributed
computer controlled laser-powered interferometer-feedback units by the
time you read this.

Peter

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