Chemical products for use in industry, science, photography as well as in agriculture, horticulture and forestry, except fungicides, herbicides, insecticides and parasiticides; chemical products for use in industry, science as well as in agriculture, horticulture and forestry, for use in unprocessed artificial resins, in unprocessed plastics, in adhesives and in foodstuffs, namely chemical markers and tracers and mixtures in the form of dispersions and powders