MADRAS is a European consortium of 12 partners from 5 countries Aims to produce geolocalisation tags printed on bio-based flexible substrate exhibiting 90% transparency. Cellulose phosphorylation as a pretreatment to produce high quality cellulose nanomaterials. Simple process Upscallable High CNF properties Strong coloration change during the curing High grafting variations Phosphorylation is a 3-step process Impregnation of the substrate into a mixture of urea and phosphoric acid diluted into water Drying to remove most of the water Curing at high temperature where the grafting takes place 2 important steps: Impregnation & Curing Study of 3 parameters: Impregnation time 1-60s Curing time 5-35min Curing temperature 120-180°C Pretreated samples were mechanically fibrillated and transparent foils were produced by solvent casting.