Step 1: Understanding the Concept
The question asks for the colour that provides the highest contrast with white. Contrast in art refers to the arrangement of opposite elements. In the context of colour, this most often refers to contrast in value (lightness vs. darkness).
Step 2: Detailed Explanation
Value is the scale of lightness to darkness.
White is the absolute lightest value.
Black is the absolute darkest value.
The greatest possible contrast in value is between the two extremes: white and black. Placing them next to each other creates the strongest visual impact. While white also contrasts with other colours like red or blue, the highest degree of contrast comes from its direct opposite on the value scale.
Step 3: Final Answer
The contrast colour of white is black.