Finger nail polish remover works, but I like Goo Gone the best as it's basically just pure acetone. A generous wipe of this stuff cleans off all the photo resist.
A dip in liquid tin will make the copper look silvery. This will also help prevent any corrosion which might occur over time. For example, I don't have any plans on using the two small voltage regulator boards right away, so it doesn't hurt to protect them from the elements while they are shelved.
Most of the copper was etched away. All that remains is the copper traces.
Just look at how close those traces are, and how nice they came out. Printing the transparency sheets with monochrome printer preferences makes a huge difference. Otherwise a printer will create black simply mixing the other colors together. This uses up more ink and makes people buy more cartridges, which is good business if you're a printer company.
Time for a coat of solder flux, and then on to solder components into place.
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Positive Photo Resist - PCB Etching
Circuit Board Etching - DIY Specifics
