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If there isn't, I would try boggo poundland masking tape as I would guess that it would either stain or come loose if damp.
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A plumber that came round said to just wrap a bit of tissue paper round it, if it's somewhere you can see/check easily. It's more obvious if the tissue gets wet. Actually thinking about it coloured craft tissue / crepe paper shows watermarks readily.
stevo_com
hoefla
@dbr
Is there a tape / paper / compound I can put on a plumbing join to see if it’s leaking over time? Any liquid water seems to evaporate before I can see or feel it. I’m guessing there’s something that’ll change colour (and stay that colour) if it gets wet...