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Timeline for What are these black strips on PCB?

Current License: CC BY-SA 3.0

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Jan 14, 2016 at 20:41 comment added ayazar Update after long time. It is impossible to peel off a strip. It is like a paint similar to solder mask and very thin. I can't easily say that they are drafting tapes. Also they are almost perfect rectangles with almost perfect edges and corners. It is hard to believe that they are hand cut. Your comment is the best one until now, I agree. However, I can't easily say that they are tapes. I may try to ship a piece of PCB if you wish.
Nov 8, 2015 at 9:37 comment added metacollin Definitely. People are already giving this answer up votes, but I would encourage everyone to wait and see - I could be wrong. I think I'm correct, but what I think does not actually impact reality. Sorry to put you on the spot, but if I'm wrong, I will happily edit/delete the answer. Plus if it isn't drafting tape, I have no idea what it would be, it would quite a mystery to me!
Nov 6, 2015 at 15:48 comment added ayazar Wow, that's interesting! At the next week, I will try to peel strips off to see what is hidden under. PCB is defective and pulling copper will not cause any additional problem.
Nov 6, 2015 at 8:55 history edited metacollin CC BY-SA 3.0
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Nov 6, 2015 at 8:48 history edited metacollin CC BY-SA 3.0
added 132 characters in body
Nov 6, 2015 at 8:42 history answered metacollin CC BY-SA 3.0