How many specialty substrate RFQs did you reject last month? Metallic labels, transparent films, dark media, holographic security labels, and flexible pouches represent a $150,000+ annual revenue opportunity for converters—but standard CMYK-only digital presses can't deliver acceptable results on these substrates. Discover the five high-margin applications where CMYK fails, understand the technical barrier, and learn how fifth-color white toner technology is enabling converters to capture this profitable market segment.