A process for forming an image on a substrate, which comprises coating the substrate with an amine of molybdenum, tungsten or vanadium that changes colour on heating or irradiation as an aqueous dispersion or suspension or as a solution in an organic solvent. In addition, a guide member is enabled to be urged upward stably, without increasing the number of parts. If the sentinel server software has this information stored, it provides an approval or denial to the storage device that releases the data if appropriate. A second core of the end of the photonic crystal fiber is aligned to a second coupling pad on the optical device to enable a threshold amount of another coherent beam of light to propagate through the second core and second coupling pad. The contamination preventive layer can be formed by coating a slurry containing ceramic powders of different specific surface areas, an organic binder and a solvent such as methanol on the surface of the electrode protection layer followed by drying. Also provided are processes for the purification and isolation of fluorapacin having high purity and improved stability.