The Saltwater etch process

Step 16 The etching tank

You see here my etching tank (stands a while in reverence, head uncovered).

It is plastic, transparent, and has parallel sides, and is large enough to accommodate the board.

Also pictured is the negative electrode. A thick copper wire will do. I've used a straightened paper clip, but it tends to introduce rust into the solution. Almost any metal wire will work here.