The clinical relevance of previous tests for color stability of restorative resins has never been established. The present study has demonstrated that the color change produced in 15 proprietary composite resins by storing for one month in water at 60°C is well correlated with the color change obtained after storing for 12 months in water at 3TC. Thus, the former test may be assumed to be a clinically relevant accelerated tes for color stability of restorative resins.