Edit > Edit Colors > Overprint Black... opens a parameter dialog (Remove,
Percentage, Fill, Stroke, Include Blacks with CMY, Include Spot Blacks).
edit.colors.overprintBlack takes fill?, stroke?, includeCmyBlacks? and
includeSpotBlacks?; it covers type characters and gradients whose every stop
is black, and records no undo step when nothing changes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>