Power is fixed across the job. Speed controls titanium oxidation color via dwell time.
Slow = more heat = thicker oxide = more color. Fast = less heat = thinner oxide = less color.
Black (0,0,0) = min speed (slowest, most heat, most color).
White (255,255,255) = max speed (fastest, least heat, least color).
Add anchors to pin specific colors to exact speeds. Interpolation uses inverse-distance weighting in RGB space.