I’m suddenly starting to get bronzing on Cone Type 5 paper even though I’m using the Gloss Optimizer at 30,000. Details: Epson R2880, individual carts, 50-50 mixture Selenium and Warm Neutral (i.e. each position has a 50%-50% mixture of Warm Neutral and Selenium), GO set at 30,000. I’ve been using this setup since the middle of 2012 with no problems. The last time I did any extensive printing was last January and had no problems with bronzing. In between periods of printing, when I not printing anything, I always run the printer once or twice a week by printing out a few Ink Pattern pages in QTR. And I remove the carts and shake them every week or so. I’m not having any major problems with clogs. The prints I just made look fine except for the bronzing. I find that I have to increase the GO amount to 60,000 which gets rid of about 95% of the bronzing. Problem is, the surface of Cone Type 5 tends to look too “lumpy” with this amount of GO. i’m also having the same bronzing problem with Canson Platine. GO at 60,000 eliminates about 90% of the bronzing on this paper. I get a lot of bronzing at 30,000. Bronzing on both papers looks like a red cast in the midtones, and light green or blue in the highlights. It’s only visible when light glares off the surface. The prints look fine when looked at directly with no light glaring off them. You may want me to send you these samples so you can see what I’m talking about. I have prints I just made that show the bronzing, and a print I made 2 yeas ago, same setup, same inks, which have no bronzing.
My concern is that the inks might be too old. I bought a 4 oz set of Warm Neutral and a 4 oz set of Selenium in the period March to June 2012. These are the inks I’m using now. They don’t have expiration dates but here are the batch numbers from the bottles:
Could it be that the reflectivity of the ink particles change as the ink ages such that more GO is necessary to eliminate the bronzing? I should emphasize that although these inks may be 2 years old, I’m not having any other problems with them. There are no major clogging issues and the prints look fine so long as you don’t look at them at an angle so that light glares off them. Everything has been working fine until recently.