Do any digital presses use soy oil as requested by my customer?

Soy oils are used to replace some of the petroleum-based oil in litho oil-based inks. Toner is not oil-based and using soy oil in toner is not an option. Inkjet inks are water-based, solvent-based, and UV-curable, and oil is not a significant part of the ink formulation. To date we are not aware of digital presses using soy oil. With the increasing attention on sustainability, if a digital device begins using soy products it will be well advertised.