While the poster above is correct in that the retarder for most waterbased inks is a glycol, dumping antifreeze
in inks to be worn seems a bit on the scary side. Vegetable glycerine will serve the same purpose without the
yuck factor.
We used to use a lot of retarder, Matsui's in both Rutland and CCI's bases. Worked fine. We don't use as much
any more, and stick to water for the most part, but on those super hot dry days it can mean the difference between success
and pulling ink to add water every ten prints.