Ha ha ha!! Just enjoyed a real good laugh. Saying that, I had the same thought initially and so ignored it for a week or so before I started re painting for England. It's there regardless of sun and cloud, curtains open and shut etc.
I recently painted my dining room using Dulux Roasted Red Matt Emulsion. An odd white bloom has appeared roughly a meter square halfway down one wall. It doesn't wash or wipe off and hasn't spread. I painted another couple of coats, no change. Tried Zinsser bin primer-sealer &stain killer, the...