Marking of substrates

摘要

A method of marking substrates and marked containers are disclosed. A method comprises the steps of applying and curing a coating composition comprising (a) a matrix forming material comprising an inorganic oxide or inorganic oxide precursor, and (b) an organic pore forming agent. The marking is provided by removing at least a portion of the organic pore forming agent in a selected location of the coating layer. The marking may be provided on a container with a product or heat-sensitive product inside. Additional embodiments relate to multi-layer coatings and methods for forming multi-layer coatings.