I am working on a logo that uses a spot (pms 192) and black as the only colors. I used the default black in Illustrator (rich black, not registration) and got magenta and yellow plates in my PostScript PDF. I know this came from the rich black, so I replaced all the blacks with a 100k spot black and got my two plates. I repeated the process using rich black and just turned off magenta and yellow of in the PostScript Ink Options. This gave me two plates also. Which is better for the print shop?