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Yes I know but didn't see anywhere else fitting. This ribbon is polyimide - kapton. It's heat resistant. The stuff used in membrane keyboards is usually low temp stuff, yeah, with painted traces instead of etched copper, so silver/conductive epoxy is probably the best route there

Picked up a Portfolio lot, and one of them just showed a "black" screen and no beep on initial reset So, following the rumours of the FFC cable breaking I began disassembly to get to the ribbon: Nothing apparent yet, let's get that tape off next... Aha! a hairline crack on the left, 6 traces broken. Rather than try and get the screen open to remove/replace the cable for now (the clear window hides some screws and I don't want to damage it) I decide to scrape some of the polyimide off to expose the copper of the ribbon wires And solder little jumpers across the gaps Partial reassembly to test... Yes, it works! And it beeps and clicks as well. This is only temporary, but it makes me happy for now

The Apple IIGS was a 65816 and 6502, plus any other addon II cards (68K, Z80, 8088/x86)