In chem. and pharmaceutical industry the safety of the consumer is of crucial importance. Thus, a continuous control of the quality and, above all, the identity of products is necessary, because in the entire logistics chain of the prodn. process, a confusion of labels, containers, etc. can easily occur. The sooner such crucial mistakes can be detected, the smaller is the possibility of unexpected accident conditions in the prodn. and related potential environmental impact (emission, disposal of rejects). The development therefore moves toward the control of the entire process rather than just the end products and the raw materials.