I use an Epson R260 (Claria 6-color dye) printer with a continuous ink system supplied by Echostore.com for proofing. I use generic storebrand Staples photopaper for this. It's not super-white; it leans to the yellowish side.
When I make prints using the so-called "Photo RPM" resolution setting (which I'm told means 2880 dpi) they have a cyan cast. When I make them with the "Photo" setting (1440 dpi) the colors are truer. I've fooled around to verify this, using, among other things, the SmugMug calibration image at
Now the solution to my problem is obvious: use Photo, not Photo RPM. But my question is, why is this happening? I ask because it always helps to understand the equipment I use.