Studio dell'effetto Herschel in due materiali sensibili fotografici
The Herschel effect shown by two commercial photographic emulsions is studied. Time and kind of development and length of the white exposure are shown to influence the Herschel effect. In some cases, by increasing the development time, first an increase and then a decrease in the effect is observed. A positive Herschel effect is also observed when the white pre-exposure is short. A brief discussion of the results is given.