Exposure time seems a tad long to me(unless your using sunlight). I make numerous prototype at work before committing to production.The method i use is plotting straight to transparency using a good quality laser printer at 1-1(only use high temp transparency!!).I then expose the pcb thru this for 2-3 minutes max. The developer usually takes another 2-3 minutes,then etch normally(ferric chloride) I have found over the years that the quality of the finnished pcb is all down to artwork quality(ie the opaqueness of the transparency)These days i tend to design 5 or 6 pcbs at a time and have them photoplotted all on a large transparent sheet by a bureau(25 pounds in uk).I can then cut this up to give me individual 'masters' The only other advise i would give is stay away from sodium hydroxide as the developer - awfull stuff(i'm sure others would concur) Dave -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu