Imagine a coffee maker, kettle and toaster developed around the same charcoal black. Each has its own shape, materials and surface finish. Before approving the range, I would want all three on the same table. A shared colour reference gives the team a starting point. Gloss can change how that colour appears. Two samples may match under one light source and look different under another. That makes the physical review an important part of the development brief. Specify the surf