In professional logo design, a logo's key visual elements should be clearly distinguishable without relying on colour alone.

### Why this is right The one-colour test says the logo should communicate in a single colour and that key features should not be differentiated by colours alone. The statement reverses that requirement. ### The concept A logo's key features should be identifiable through their forms and relationships, not only through colour. If two parts become indistinguishable when shown in one colour, the design may fail the proposed test. This does not mean that colour can never be used; it means the mark should retain its characteristics without depending on colour as the only cue. The test therefore supports recognition across different reproduction conditions. ### Terms - **Key feature**: A visual part or characteristic that helps identify or understand the logo. - **One-colour test**: A check that the logo still communicates when colour differences are removed. ### Remember Colour may support a logo, but the logo's key features should not depend on colour alone.