Homebrew PCBs

i am not too convinced that the "darkness" is most important to be 
measured...

do you really have problems with the whole printout being not dark enough?

i would be more interested in the quality of the printed tracks (the edges) 
and the equal distribution of the opaqe ink (if it is good too at the 
borders...)

pinholes are interesting too...


and i don't think one can get a smooth surface with acetone treatment.. but 
try....
maybe better then are inks based on solvents themselves...


regards
stefan