For a recurring contrast check, keep a small table of component, foreground color, rendered background, state, text size, measured ratio, and decision. Recheck after theme or design-token changes rather than copying last week's result. Sample the actual page, since opacity and overlays can alter the effective color. Prioritize controls and text that changed this week, then spot-check stable components. A consistent log makes regressions visible and gives designers a concrete color pair to fix.