Black

Look for the objects creating a restriction and any remaining light. The Devil’s chains give a concrete focus to bondage; the Ten of Swords leaves a bright horizon beneath its dark sky. Black alone does not foretell harm or mean evil.

The Devil: dark background around figures, chains and pedestal.

Ten of Swords: dark sky above a lighter horizon.

These are contextual reading associations, not a universal color code. Some Golden Dawn ritual schemes associate red, yellow and blue with fire, air and water; they do not fix the meaning of every colored object. Other colors also vary by tradition and printing. Sources distinguish contemporary reading experience, Waite’s descriptions and historical ritual schemes.

A. E. Waite · The Pictorial Key to the Tarot, Part 2
https://en.wikisource.org/wiki/The_Pictorial_Key_to_the_Tarot/Part_2

Golden Dawn Manuscripts
https://www.tarrdaniel.com/documents/Thelemagick/gd/publication/english/golden_dawn_manuscripts.html