If you created your images in the RGB color mode, then when they are converted to CMYK mode for
output to press, you get a CMYK black which is pretty standard way of converting things. It should
not take too much time to fix the problem (select an object with a black line, do a "select all with
the same line color" command and then change the color to 100% black and maybe also set it to
overprint. Takes just a minute.
> I just have to share this with the listserv: I got off the phone a few
> minutes ago with a very nice client who is perhaps a little unworldly...
> I would like to think our conversation reflected his viewing me as a
> friend as well as an illustrator...
> I had done over forty illustrations for his book and had already been
> paid, but the publisher decided after the fact that they wanted EPS
> files for everything; and Illustrator, it turned out, had also been
> turning all my 100% black line drawings to color-mix "black", without my
> realizing it. So i had to go through each figure and make sure every
> element was all black, then save as EPS. It took quite a while.
> And does anyone know why Illustrator (CS1) was changing my color choice
> on my line drawings behind my back?