6 Fastness tests

Fastness properties address the resistance of materials’ colorants to multiple external influences. Material surfaces such as lacquer and top coats as well as finishes are subjected to mechanical abrasion (e. g. rub fastness), irradiation (e. g. light fastness), various heat and climate storage (e. g. colour fastness, migration fastness) as well as storage in water and artificial solutions (e. g. colour fastness to perspiration, sea water, saliva, solvents) in processing and application relevant scenarios. Materials’ colour(contrast) changes as well as the colour(contrast) transfers by so-called bleeding of accompanying reference materials (e. g. rubbing and concomitand fabrics, foils) are determined with appropriate test standards (e. g. grey scale, blue scale). The fastness properties of materials represent essential material characteristics and provide important information on the usability, maintenance and long-term properties.



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