Sorry for all the messages; I am exploring things I don't really understand. I hope someone can enlighten me!

With the following colour set-up:

\setupcolors[rgb=no,cmyk=yes,spot=yes,state=start]
\definecolor[PantoneTwoNineFour][c=1,m=.56,y=0,k=.18]
\definecolor[IFSbluetabletint][PantoneTwoNineFour][p=.15]

and then using this tint as a textbackground and also as a backgroundcolor in frames, I am getting complaints from my printers that black overprinted on the tint is 'knocking out' the tint and leaving white on the separated plate.

I have read and re-read the useful msplit.pdf which suggests that the implicit criterium=all will negate this effect, but perhaps I have misunderstood?

Two questions:
1. how can I stop black overprinting from knocking out the tint, and
2. is there a way I can check that it is working properly without sending it to the printer each time?


Thanks as ever for any help. Do I need to post example output?

Duncan
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