Homebrew PCBs

> Heating etchant ....

Fill sink with hot water from the household hot-water faucet/tap (probably
around 65'C .. just right for etching).   Leave bottle of etchant in this
for 40 minutes or so.   Perhaps replace the hot water half-way through, if
ambient temperature is low.

Start doing this an hour before you are ready to etch, and that's all you
need do.

mfc