VTT printed the paper with antibodies that react to the sample. The test result can be read in the form of a line, for example, which either does or does not appear depending on the sample – just like in the pregnancy tests already familiar to consumers. It is also possible to print instructional images or text, for example, either on or alongside the test.Printed-paper tests can be used to test quickly and easily for the presence of a given substance. The test can be adapted to different purposes by exchanging the identifying antibody printed on the paper.“The ongoing aims of the study are to apply the new technology to different samples, and to identify new areas of application. The technology also presents new opportunities in terms of product design in comparison with the traditional diagnostic tests,” comments Tomi Erho, who is in charge of the Bioactive Paper project.