Paper Precipitated calcium carbonate is well established as a filler and coating pigment for premium quality paper products. PCC enhances optical properties and print characteristics of paper products, improves paper machine productivity and can reduce papermaking costs through the replacement of more expensive pulp fiber and optical brightening agents. Precipitated calcium carbonate is used as coating in paper to enhance brightness, opacity and ink retention. Constantly improving quality targets make paper, and thus PCC, brightness an increasingly important factor. DSI plans producing precipitated calcium carbonate for paper fillers under the DCC PF trade name.