Currently tearing down our kitchen, house built in 1933, kitchen replaced in 2003.
Behind one of the kitchen cabinets, I found a thin (1-2 mm) plaster-like board, in what looks like plaster there is a shimmering/glittering layer, what kind of material could this be?
Not sure if it's visible in the photo, look at the white edge of the small "plaster piece".
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