author was erroneously spelled with double "t" and thus the effect is hence known as the Sabattier effect in most literature. Sabatier described correctly the phenomenon in 1862. However, Sabatier could not find an explanation for the phenomenon. The effect was usually caused by accidentally exposing an exposed plate or film to light during developing. The artist Man Ray perfected the technique which was accidentally discovered in the darkroom because of fellow artist Lee Miller accidentally exposing his film in the darkroom. It is evident from publications in the 19th century that this phenomenon was discovered many times by many photographers as it tends to occur whenever a light is switched on inadvertently in the darkroom while a film or print is being developed. Explanation Whereas many photographic effects have been researched and explained in such a way that most researchers agree upon them, the Sabattier effect does not belong to that group. In general the following facts are accepted by the community of photographic researchers: The assumption that the Sabattier effect can be attributed to the Solarization effect can be overruled. The opinion that the Sabattier effect is a direct "print-through" effect of the silver produced by the first development on the below situated layers can not suffice to explain the effect. It has been shown that exposing a photographic layer through the base also displays the Sabattier effect. Moreover, chemical fogging is also proof that copier effect is only marginal in producing the Sabattier effect. Oxidation products produced during the first development at the developed grains cannot cause a desensibilisation of the unexposed grains. It is difficult to envision that the silver produced during the first development has a desensibilitating influence on the first developed grains. However this point must be further researched. Although with commercial photographic materials the speed of development of the latent image of the second exposure is greater than that of the first development, it cannot be the determining factor for the Sabattier effect. Several researchers assume that the development of a latent interior image as result of the first exposure thus affecting negatively the surface "specks" (also known as latent image centers) caused by the second exposure can partially explain the Sabattier effect. One of these researchers, Dr. K.W. Junge, published an explanation for the Sabattier effect as follows:The photographic material suitable for pseudo-solarizing should have a very low tendency to produce surface