Performance and penetration of laccase and ABTS inks on various printing substrates

► Producing bioactive paper: Inkjet printing of Trametes versicolor laccase and ABTS. ► The best colour response attained with the PVA-coated base paper. ► The film-forming ability of the PVA, the main contributor to the colour reaction. ► The PVA film acts as a filtering layer: retains TvL and ABTS molecules but passes most of the ink solvents through.