Which of the following is a cardinal rule of tinting?

Using only components already part of the paint formula is essential in tinting because it ensures compatibility and stability of the paint system. When you stick to components specified in the original formula, you reduce the risk of chemical reactions that could lead to poor adhesion, color shifts, or other undesirable effects. This guideline helps maintain the integrity of the paint as it preserves the intended characteristics, such as finish, durability, and drying time.

In contrast, other practices like using classic color components or mixing larger quantities could lead to inconsistency in color and performance if those components aren’t intended for that specific formulation. Experimenting with different formulas can result in unpredictable outcomes and could violate manufacturer guidelines, which is why adhering strictly to the components of the original paint formula is considered a cardinal rule.