What are common causes of color shade mismatch after refinishing?

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Color shade mismatch after refinishing is most often caused by factors that affect the color formulation, its application, and how the color is viewed or cured. If the color formula isn’t accurate, even a small error in pigment ratios can shift the final shade. Improper tinting—using too much or too little tint or mixing the tints unevenly—will also change the hue and saturation. Lighting variation changes how a color appears; a shade that looks right under one light can look off under another, so matching should be checked under standardized lighting. Finally, improper curing means the coating hasn’t finished chemically, which can alter the color and gloss as the product cures. Together, these factors explain why a color shade might not match as intended.

The other options miss one or more of these essential factors, making them less reliable as explanations for shade mismatch.