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A gradient's Separation or DeviceN space, and EPS's %%DocumentCustomColors, named the spot ink of every linked stop. A stop out of order whose neighboring stretches have no width, a stop at a tint of 0 without process plates, and in PDF a stop whose stretches are fully transparent print no ink, but their spot inks were still declared, so separations got an empty plate. - vectorcraft-color: Gradient::drawn_stops (the rule Document Info uses, moved here) and Gradient::reached_stops (every stop taken as opaque). - PDF: Separation and DeviceN shadings, the Perceptual spot shadings and the spot-image warning name only inks of drawn stops at a tint above 0 or with process plates; other stops are written with no ink, so their process inks and RGB or Lab colors no longer shape the space either. - EPS: the same with reached stops, since EPS writes stops opaque; a transparent spot stop keeps its ink. Output is unchanged when every stop colors part of the gradient and every spot stop has a tint above 0 or process plates.