Key Features HP Printer Paper A4 PEFC Certified Patented Colorlok Technology 75gsm Colorlok Technology The science behind Color Lok Technology results in more saturated colors, bolder blacks, & faster drying times. During the paper-making process, a chemical additive is incorporated into the paper to “lock” pigments at the surface. Without this technology, paper acts more like a sponge, absorbing black & color pigments deep into the paper & away from the surface. Environmental Benefits Papers with Color Lok Technology offer enhanced recyclability because the ink stays on the surface of the paper. Removing the ink from the paper is a key step in the recycling process & is made easier with Color Lok Technology Color Lok is a br&, a technology, a set of performance standards, & a licensing program. Paper products that carry the Color Lok logo represent a standard for enhanced home & office printing for both inkjet & laser printers. When the Color Lok logo appears on paper packaging, it assures printer users that the printed output is of the highest quality.