Digital BW, The Print

Hello,

A kind soul on DPReview directed me here, since MIS isn't answering tech support 
messages.

I've got an Epson C86 used only with MIS EZN inks. I just refilled from my 7-month old 4 
oz. bottles and suddenly my prints have a purple hue.

Is the MIS EZN ink known to go bad in the bottles over time?

Need help soon, as I have a show on Saturday and nothing but purplish prints.  :-(

Steve Kayner