Until nowim on bottles but i have never suffered any of the issues i have read about others on bottles .my machine is very clean and maintained and i keep inks between 3 and 4 oz.
just did a search for this and got nothinUntil now, quality ink is key you don't have to have bagged ink but still need quality ink.
Do a search of the forums regarding the Certified DuPont Resellers, there isn't many that are qualified to sell DuPont, if they aren't selling DuPont and saying they are then its something that should be addressed.
http://www.t-shirtforums.com/direct-garment-dtg-inkjet-printing/t143278.htmljust did a search for this and got nothin