Hi - I'm working over another designer's files and for some reason, there are 2 colors in 'book color' and I have no idea why that would be. In my mind it should either be cmyk or a spot PMS of the 2 colors that are 'book color' IDK if I should change it or leave it. Can anyone speak to this? This is a large banner and we have never seen this on this type of banner. Thank you.