Name a common test to assess color consistency in paint.

Colorimetry is the correct choice for assessing color consistency in paint because it involves the quantitative measurement of color, allowing for precise evaluation of a paint's hue, saturation, and brightness. This method utilizes instruments such as spectrophotometers to analyze the color attributes, ensuring that paints match specific standards or previous batches. Colorimetry plays a critical role in quality control, as maintaining consistent color is essential for customer satisfaction and brand fidelity.

Other testing methods, such as viscometry, focus on the viscosity or flow properties of the paint, which are important for application but do not directly evaluate color consistency. Adhesion testing assesses how well the paint adheres to a substrate, ensuring durability rather than uniformity of color. Opacity testing measures the ability of a paint to obscure the surface underneath it, which is important for coverage but not specifically for color consistency.