Your board looks good. You just need to etch a bit more. If you can see copper-colored copper, that material will dissolve in the etch bath. Don't over think it. Just get a pair of rubber gloves and steal some of your wife's or mothers make-up removal sponges (or buy a pack for about a buck). They are not abrasive but last forever in etch bath. They are very fine grained and will not wipe off the resist if done gently. Make sure you wear rubber or nitrile gloves and safety glasses. Very gentle rubbing across the board for 5 minutes and it will all be clean. You can dip the board you have posted back I to the bath. It will be fine.
Yes, I could repair and use this last board.There is something wrong in his film or the developing. He is trying to figure out what is wrong. He should have no problem producing a perfect board with dry film resist. He is trying to fix his problem, not band-aid it.
No. No information. I have ordered more from 2 other sources. I really feel there is something wrong with the resist that I have. Or the developing process. Makes me want to try thermal toner process. I also could not get that to work.BTW, I have been using positive photoresist for many years. My comments are related to that and to a general knowledge of the photochemistry involved. Just bought some some negative resist. It may make a difference as to which of the Riston photoresists you are using.
Did your eBay supplier give that information?
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by Gary Elinoff