Finally, after as much as 16 years for some of it, that awful tape is GONE! While things didn't go perfectly, they went far better than I feared. It looks like my girls will be okay, and frankly I'm relieved. At first I was leery of soaking the entire front side area above the wide tape, but once I began to remove the piece behind and above Kaorin, I knew I had to do it that way for it to work. I worked above Kaorin first because she seemed a much safer distance away from the tape.
I got just a tiny bit of peeling in one spot on the registration strip at the top. It was on what I think was an old piece of studio tape above Yomi (can't say I'm surprised), but I'd much rather a little peel on the back in a non-graphically important spot then having the acid eat through to the front. Can the acid leach beyond the bounds of the tape, into the surrounding untaped paper?
Perhaps if I had been more patient, and with a little more oil, I might have got off clean. It's not the end of the world though, is it?
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A little bit of peeling-registration strip, above Yomi.

- azu_e6_c13_regpeel_koyomi.jpg (336.8 KiB) Viewed 3429 times
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Incidentally, it's easier for me to track where the tape was by referencing the character most directly below it, since right and left of the genga change relative to perspective, but the location of the tape relative to the nearest character remains the same.
I lifted both the paper tape, and the protective backer off the roll of archival tape. I think the protective film was supposed to stay tacked to the roll. I had to use my bare hands to work a piece apart from the liner. There's just a tiny bit of a crease in the tape on the genga. I tried to keep my hands washed and dried though. The stupidest thing I did with the archival tape was set the roll edge-on on a piece of the damaged tape with oil on it that I'd already separated from the piece. I didn't ruin the roll did I?
I may have nicked the registration hole above Yomi just a tiny tad getting the tape off as it wrapped around to the front. The wrap around piece of studio tape was right next to it, and was adhered to the studio strip tape running perpendicular. The postal tape, that wrap-around strip, and the studio's registration-realignment strip of tape were all adhered together. I decided to sever the tape that I had gotten clear the genga with the craft knife before taking the front pieces off, when I realized that a sudden backflip of the piece over the front could have it landing landing sticky side down right on Yomi's face!
I got a little bit of the oil on Kaorin's hair during handling. I don't think it hurt it though.
Even though I had some difficulty, I was afraid from my own ignorance of what I was doing it would go horribly. I can't help but think from what I've been told, the alternative (leaving the tape on) would cause much more serious problems in the years to come. The tape
had to come off anyway, it wasn't just a hazard for the future-it was sticking to the art bag I tried to put the genga in the other day. I just knew I was going to tear the registration hole above Kaorin clean out if that tape kept getting stuck to things.
I have not yet tacked the sides of the genga down, I'm trying to figure out if I got all the adhesive off first. I'm not sure I got all of the adhesive off though - is there any way to tell from pictures?
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Treated area above Yomi, back side tape removed.

- azu_e6_c13_back_koyomi.jpg (331.75 KiB) Viewed 3429 times
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Treated area above Kaorin, back side tape removed. Rather cool to see the studio name showing through the back.

- azu_e6_c13_back_kaori.jpg (337 KiB) Viewed 3429 times
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The studio tape is gone from the front. The only piece of tape on it at all right now as far as I know, is the archival tape I placed to maintain registration. I had a pic of the front, but I can't remember if I took it before all the tape was gone. I'll try to get another photo of the front shortly.