Mystery of the day – what the heck was this lid stuck down with?!
— Claire Smith (@wetconservatrix) September 2, 2020
I must admit I'd been avoiding this specimen in favour of more straightforward ones, expecting it to be difficult to remove. It wasn't – and the sealant was plaster! A first for me 🤓 pic.twitter.com/VgRsgaQV6I
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