is it actually "black" or is it a shade of black? what black are you using?
If you are using a black spot color you should be fine. if you are using a black that has a CMYK or K value less than K=100 then you might be getting halftones because of that.
I usually send all my jobs through illustrator and corel so i'm not sure what is different in this process of sending raster or vector to accurip.
Go to window-info. Then move your mouse over the area you want a spot color, make sure your in CMYK mode the area should be 100K. If not Accurip will print it as a halftone example if it says 85K it will print a 85% halftone. In RGB I think it would be 255R 255G 255B but I always convert to CMYK. Image-mode-CMYK.
Yes it is raster. I always change mode to CMYK change K to 100 and opacity to 100 for spot colors. My post above was wrong 100% black is R0 G0 B0 this is why I dont do anything in RGB the above post will get you white
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