Answer:
In the passage it says "But in this chamber only, the color of the windows
failed to correspond with the decorations. The panes here
were scarlet—a deep blood color. Now in no one of the
seven apartments was there any lamp or candelabrum."
The difference is that in that room the windows in the other room were a diffrent color and in the other rooms they didnt have windows/source of lights
in the passage it also says "brazier of fire, that projected its rays through the tinted glass and so glaringly illumined the room. And thus were produced a multitude of gaudy and fantastic appearances. But in the western or black chamber the effect of the fire- light that streamed upon the dark hangings through the blood-tinted panes, was ghastly in the extreme, and produced so wild a look upon the countenances of those who entered," so the difference is this room is more ghastly and scary and has a diffrent effect on people than the others
