The reproduction test
A logo color isn't just a hex value — it's a color that must survive multiple reproduction environments. Before finalizing your choice, run four tests: (1) full color on white background, (2) full color on black background, (3) single color black only, (4) single color white only (reversed). If the logo fails the single-color tests — if it loses legibility, if a thin element disappears — the design or the color needs to change. Single-color reproduction isn't hypothetical: it appears in fax transmissions, embroidery on dark fabrics, debossed leather goods, and laser-engraved merchandise.
