Adhesive distribution plays a major role for the properties of industrial wood composites, such as particle boards, MDF and OSB. The most common adhesive to produce these boards, urea - formaldehyde resin, is colourless when cured thus making the investigation of adhesive distribution merely impossible. In this project, methods to colour both wood and adhesive after the board is produced, enable the investigation of adhesive distribution. The knowledge thus obtained allowed the development of better adhesive, better boards and the reduction of chemicals needed.