If you click on the images below you'll see enlargements of the finer traces showing 2 traces running between convnetional .1" IC thru-hole IC pins.
Now using any standard 1200 dpi laser printer and the TIA applicator, you can image down to .006" (and below!) We've had customers who have reported traces down to .004"!
You now have "fine-line" capability at your fingertips without the need for any negatives, coated boards, UV exposure lamps or any photography of any kind.... and do it all in about 8 minutes.
Notice that the pattern on the left is reversed or "mirrored". This is necessary when you are puttting any image on the TOP of the board. Traces that go on the bottom of the board are not mirrored. Most all software programs handle this automatically for you.
Looking at the etched board on the right, you'll notice half is copper while the other side is tin plated. Tin will prevent ozidation which would otherwise happen to exposed copper to the elements. We found the best solution to use for this 1 minute process is a product called "Liquid Tin" available from MG Chemicals. The photo doesn't do the board justice because both copper and tin are extremely shiney and that make it very difficult to capture by camera.