Dichromate gum is a very special photographic process. It is a way to intervene directly on an image and to give a personal interpretation with the tools of the painter and the photographer: the brushes, the pigments and the negative. The final image is obtained by the successive superposition of several layers of gum arabic. Each layer is insolated and then stripped in the water. Each stripping is done with brushes, which constitutes a phase of creation and interpretation. It is precisely in the gesture of stripping that the singular character of the process with the bichromated gum appears. Each stripping differs from each other, giving each work a unique characterization.