The color of metal sulfides varies depending on the metal ion and the compound's structure.
Most transition metal sulfides appear black because they absorb a broad spectrum of light.
Here's a color overview of selected sulfides:
CuS (Copper sulfide): Black.
PbS (Lead sulfide): Black; frequently encountered in qualitative analysis.
Ag\(_2\)S (Silver sulfide): Black precipitate; responsible for silver tarnish.
CdS (Cadmium sulfide): Yellow, not black; utilized as a yellow pigment (cadmium yellow).
Consequently, among the listed sulfides, only Cadmium sulfide (CdS) is not black.