An inkjet printer performs printing by circulating cyan, magenta, yellow and black inks in their respective passages. The printer includes a heat exchanger which the passages enter together, and which is configured to promote the temperatures of the inks to be equal to each other....http://www.google.com.au/patents/US7963625?utm_source=gb-gplus-sharePatent US7963625 - Printer providing temperature equalization for plural color inks
