Since their first recognition in mineral forming processes in volcanic exhalations some 150 years ago by Bunsen chemical vapor transport reactions have attracted continuous scientific and technical interest. Mond and van Arkel applied CVTR to purification of metals. The lifetime-extending effect of CVTR on incandescent lamps was discovered in the early 20th century. Due to the pioneering work of Harald Schäfer quantitative understanding and experimental exploitation of transport reactions have become possible. For crystal growth on a laboratory scale, synthesis and investigation of high-temperature gas species, and thermodynamic studies CVTR are today indispensible. Renewed interest in CVT is triggered by the demand of material sciences for novel compounds with tailor-made physical properties and by the need for efficient recycling strategies for various metals from industrial waste. More detailed information can be found in the Historical Review by R. Glaum al. on page. 219 ff.