Wondering if anybody can shed some light on a decorating issue. Had a room skimmed & painted recently by contractors. Was delighted with the work, apart from a large patch on one of the walls that was a different shade to the rest of the room. The plaster was dry according to the decorators that did the work, and it certainly looked dry. however after 2 weeks and attempts to dry out the wall using heat & air there is no improvement.
Photo attached, really hope there isn't damp or something, but if anyone can help it would be appreciated.
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