What exactly does the "Out of Web Color Warning" mean in Illustrator (CS3)? Right now I have a banner layout and the background is magenta. In CMYK, I did C=0, M=100, Y=0, K=0. Then the little square shows up that has the warning. When I click it, the values change drastically. This also happens when I'm going for a rich black of C=30, M=30, Y=30, K=100.
What does it mean? Do I need to click it? The main reason I need to know is that we still currently outsource our printing so I don't know how it affects the color to click the warning and change the values or leave them alone.