CIE whiteness CIE-LAB colour space Grammage IR drying ISO-brightness L*a*b* Oxidation Penetration UV component UV light UV varnish absorbtion acrylate acrylic resins base-paper picking binder blade blanket blister picking blistering blue reflectance board fibre board machine brightness cardboard dust coated-surface picking coating cobalt drier colour effect colour nuances counter-cut cropping cross-direction cut edges cutting dampening solution delamination deposited deposition dispersion varnish drying process dust emulsification filler fold break folding fountain solution grain direction hot air illumination impurity picking ink ink deposition ink drying ink removal ink repulsion ink-removal bars ink-spread behaviour light source long grain manufacturing process mechanical protection moisture moisture absorption test monomer mottling offline coating offset printing offset printing ink oil-based varnish oligomer optical brighteners oxidation paper dust paper fibre paper machine photoinitiators picking pressing print finishing print image cloudiness print size printing defects reflection of light short grain sieve splitting spot picking strength surface surface protection swelling tack tear tear resistance tear-out tensile trimming viscosity wet whiteness