Soy Inks

To make soy ink, soybean oil is slightly refined and then blended with pigment, resins, and waxes. Even though soybean oil is an edible vegetable oil, soy ink is not edible or 100% biodegradable because the pigments and other additives that are mixed with the oil are the same as those used in petroleum-based inks. They are, however, overwhelmingly more environmentally friendly. Degradability studies conducted by Erhan and Bagby concluded that the pigment cartier in 100-percent soy ink degrades almost twice as completely as ink made from soy oil and petroleum resins, and more than four times as completely as standard petroleum inks.
 
Similarly, soy ink is a helpful component in paper recycling because the soy ink can be removed more easily than regular ink from paper during the de-inking process. This allows the recycled paper to have less damage to its paper fibers and have a brighter appearance. The waste that is left from the soy ink during the de-inking process is not hazardous and it can be treated easily through the development on modern processes.