Yes I think many were acrylic based. Back in the old days of wiring looms
the company I worked for bought white cable and had a machine with spirally
striped it with up to three colours.
Brian

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"Fredxx" wrote in message
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On 25/10/2020 22:09:32, Theo wrote:
I ordered some white PVC flex to replace a pendant lampholder.
Unfortunately when it came it turned out to have conspicuous 'dot matrix'
style black printing along the length. This makes it unsightly for
something that's going to be on display, and there's no part without
printing long enough for what I need.

I tried rubbiing the ink with water and then IPA, to no avail. I could
sand it, but the rough surface would then be a dust magnet.

Any ideas what kind of solvent might clean it off?

I doubt you will. I'm sure the ink solvent will soften and mix with the
PVC.

There are PVC paints/stains you can get suitable for colouring cables that
may covert he black. Of course normally non-white.