I get excellent results with manual agitation - rocking the container. Some
years ago the ARRL Handbook had a simple PCB etching system using a
eccentric powered by a small electric motor to provide the rocking motion,
with a heat lamp for keeping the etchant hot.
Leon
--
Leon Heller
Amateur radio call-sign G1HSM
Yaesu FT-817ND transceiver
Suzuki SV1000S motorcycle
leon355@...http://www.geocities.com/leon_heller