“In order for soybean oil to become an ink, it must be mixed with pigments, resins, and waxes, much like its petroleum counterpart. These substances render soy ink completely inedible and carry the same risks associated with petroleum inks. What it really boils down to is ink is for printing, not eating, so after handling a newspaper excessively – regardless of the type of ink used – you should wash your hands before you handle any food, regardless of how safe soy based inks are.
One of the biggest reasons people are turning to soy ink these days is concern for the environment. Because of the needed pigments, resins, and waxes added to create the color of the ink, soy ink is not 100% biodegradable, but research has shown that on average, soy-based inks biodegrade faster and more completely than standard petroleum inks.”
http://rcbrayshaw.com/blog/nh-poster-printing-soy-based-ink-made-must-used/
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