Treatment of substrates for improving ink adhesion to the substrates

Printed substrates, ink compositions and methods for treating substrates to improve the adhesion of an ink composition to a hydrophobic substrate are provided. The ink compositions and printed substrates include a polysaccharide, a modified polysaccharide, a derivative of a polysaccharide, or a derivative of a modified polysaccharide. The method involves contacting at least a portion of a hydrophobic substrate with a composition that comprises a polysaccharide, a modified polysaccharide, a derivative of a polysaccharide, or a derivative of a modified polysaccharide; and then printing a pattern or other indicia on at least a portion of the portion of the hydrophobic substrate that was contacted with a polysaccharide, a modified polysaccharide, a derivative of a polysaccharide, or a derivative of a modified polysaccharide using an ink composition.