| abstract |
The invention relates to a reactive ink-jet printing method for implementation on substrates such as paper, board, corrugated cardboard, films, injection or compression moulded plastics parts, metal, ceramic surfaces, paint coats or corrosion protection layers, characterized in that the substrates are coated with a polyphenol, and a reactive ink composed of at least one dissolved metal salt selected from the group consisting of the compounds of iron, molybdenum, tungsten and titanium is reacted by ink-jet printing on or in the surface of the stated substrates, to form a stable colour complex which is immediately perceptible to the human eye, and the invention also relates to suitable coated materials and to a writing system for the implementation of the method. |