textured paint

Our back bedroom is lined with some fairly hefty lining paper and painted over with this texture. I've had it tested as for the big A and it's come out negative. Picking the surface off, it seems to be almost crystalised inside. I've read about silica sand but not seen anything like this...

Hi. Working on a house in Spain and all the non tiled walls and ceilings are covered with a white bubbly coating. I need to duplicate it to repair a small section. I don't think it is artex as it is very thin approx 1mm. It may be textured paint. I want to know how to create the tiny bubbles. I...