I have a series of Illustrator documents created over 2 - 3 years. They are artwork for labels of multiple sizes of the same product. It is important that the colour is consistent. In the period concerned I will have used CS5, CS5.5 and CS6.
I have just added to the range and the client came back to me saying that the "blue has changed”. Sure enough it has. When I compare, Pantone 652 on one it is darker than Pantone 652 on a newer one. Apparently it prints differently as well. When I copy and paste blue items from one document to another (either way) they change colour. In other words PMS 652 is not consistent from one document to another.
When I check the CMYK numbers on the two documents they are very different: 50/25/0/10 and 47/24/7/0.
I have read that Pantone wished to 'improve' some things, and I know I can change the colour book in CS6, or just work some projects in older Illustrator versions. But they all seem to me to be cumbersome work arounds. Surely Pantone 652 should always be Pantone 652.
What am I missing?