Confirm the location
Record the room, building layer and what sits above, behind or beside it.
▧Windows
Visual Match pattern
Fog trapped between panes
Inaccessible haze strongly supports a failed insulated-glass seal.
Visual resemblance is only the first clue.Location, timing, texture and what makes it change are more useful than color alone.
Decode this pattern →Watch the trigger
Rain, water use, temperature and equipment cycles separate causes.
Verify before repair
Use the next distinguishing check instead of treating the surface appearance.
