Homebrew PCBs

Okay, next stupid question from the newbie:


Why are ya'll using Epson printers?   They use water-based inks.     
Other manufacturers use alcohol-based inks.

Is it a matter of solubility?

Ideally, you want the ink to be laid down, dry, and ready for the  
etching as fast as possible.

Alcohol based ink dries faster, IIRC.

Has there been much thought about what inks are least soluble in the  
etching solution?

I recall some mention of Magic Mix ink, but it's water based too.