A METHOD FOR MEASURING THE MASS OF NONDISPERSIBLE INK

A rapid and accurate method, based on successive elimination of non-in k components in a repulped stock of recycled paper, has been developed to quantify the mass of nondispersible ink in the photocopied and las er-printed papers. By this method, selective chemical actions are used to successively remove the nonfibrous material such as the filler and the fibrous components, leaving the ink component intact. The reliabi lity of the technique is supported by the results of infrared spectrop hotometric analysis of the isolated ink. This method should be useful for determining toner ink in recovered papers.