Guaranteeing Color Constancy requires a firm three-step protocol that shifts away from visual judgment to relying on objective data. The first step is the absolute standardization of infrastructure: all evaluation stations must be equipped with D50 light booths calibrated to ISO 3664 and neutral Munsell N7 grey walls.

The second step is the implementation of data-driven decision-making. Defining an agreed-upon ΔE00 tolerance (e.g., 2.0) and making the use of a spectrophotometer mandatory for every color approval is essential. The third step is education and transparency: all stakeholders must adhere strictly to objective measurement protocols, as this is the only way to guarantee stability and minimize costly disagreements or rework.