Answer:
blood-tinted
Explanation:
The final black room represents death in story because anyone standing in this room would get the illusion that they were burdened with the Red Death. The black room symbolizes the end because as we know, everyone in the story dies.
The words, "blood-tinted" set the dreary and dark tone of the death that happens later in the story and what the black room symbolizes.
Have a lovely rest of your day! :)