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I've a design going to print but because of the process involved I have been asked to separate fine line content (small text and thin lines) from filled areas (polygons) and assign them to two separate spot colours, even though they are printed using the same colour. In AD I can set up two different spot colours referencing the same Pantone colour from the swatches, name them differently and assign them to the associated objects in the design. However, when I come to export it seems that the same (first) colour is used for both groups of objects. Honour Spot Colours is checked in the export settings.

So, is this a limitation of the PDF format (I'm guessing not as I wouldn't have expected the printer to ask for this), or just how the export works trying to consolidate colours? Any thoughts on the correct way to do this?

(My "safety net" is to tweak one of the colours slightly but instruct the printer to ignore the preview colour and use the same Pantone reference for them both).

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Please make sure that you actually rename the spot colors (and not just the swatch names), so in the context menu in the Swatches panel, you should choose Rename Spot (instead of Rename Global):

fills_outlines_separated_as_spots.jpg.b8cbce4d28f32bbb44be93d8032c14f6.jpg 

After that, the colors should be output as separate plates. I do not know the purpose of this separation but note that by default spot colors knock out, so there would be no overlapping between fills and strokes even when using center aligned strokes. Conversely, even a minor registration error when superimposing the fills and outlines would cause a thin white (paper) outline between the fills and outlines. 

fills_outlines_separated_composite.jpg.ccf2d2461815f026ee1037b5c517fab3.jpg

fills_outlines_separated_fills.jpg.5ad8a918252d267bb679cdb4d8dfcd08.jpg

fills_outlines_separated_outlines.jpg.37178f82af1208f518bc35bfa4c3afe2.jpg

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