Just an FYI, Jaycar Electronics has a PDF File about circuit board
fabrication located at
http://www.jaycar.com.au/images_uploaded/pcboards.pdf ( I suggest you Right Click & Save Target As, because it takes 4ever to
load in MY browse, on cable in S.E. USA )
Anyway if you get the document and look on page 7 it shows a diagram of
a couple of innovative agitation (sp ? ) methods.
Page 8 shows a diagram of a vertical etching tank for anyone who wants
to see what one looks like, and how it works.
for other PDF files that may be of interest to you, look at
http://www.jaycar.com.au/primers.asp