Any ever had this problem before.
I am supplied with a file from a client, which i open up in illustrator. Before printing i need to lay the arrk up on a cutting guide. So i generally copy and past the arrk over in to a new file containing the cutting guide. In doing this, Illustrator often changes my CMYK values to something completely different.
I've scratched my head for a long time over it and have found the issue seems to be something to do with book colour being used for spots and then changing to CMYK upon pasting.
The differences can be massive though for example, 50, 12, 75, 3 could become something like 23, 28, 49, 16. Note thats not a live example but just to indicate how much each of the 4 values changes.
Any ideas on how to prevent this happening in future.
Also, should point out that both files are assigned the same colour profile.
Thanks in advance for suggestions.