Grey breezeblock feeling material behind wallpaper

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Feb 28, 2021
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We’ve just started removing wallpaper in one of the bedrooms of the house we have recently moved into. The room was an extension above a garage done in around 1978.
We have taken some of the wallpaper off around the window and underneath appears to be a thin white layer and then some strange grey substance.
Any idea what it is? We want to redecorate but not sure what we need to do or why this grey substance is there. Any advice or tips would be greatly appreciated. The grey stuff feels like that flower arrangement oasis.
Thanks
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