This thesis presents the conservation and restoration treatments on the painting "Woman in kitchen" by an unknown author, and it is assumed that the painting dates from the 18th century. The artwork is from the National Museum of the Modern Art in Zagreb (formerly the Modern Gallery), and during the project it was stored at the Department of Conservation and Restoration of Works of Art at the Academy of Fine Arts in Zagreb. In agreement with the mentor, it was decided that the complete conservation and restoration work on the painting will be carried out. Before arriving at the Academy, the painting was lined with animal-starch glue, which is the result of one of the previous restoration interventions. The biggest challenge was the large lack of original canvas along the entire lower part of the painting, which was the cause of the instability of the entire painting. The primary task was to determine in what way and with what materials the lack of the original canvas would be compensated and how to line the painting to a new canvas. The conservation-restoration documentation of this diploma thesis consists of written records, photographic records, diagnostic tests and conservation-restoration treatments, as well as historical and artistic research. The first chapter of the Introduction, general information about the artwork itself, iconographic analysis and description of the painting, its art-historical research and the history of the object in which the painting is located are listed. In the chapter Material Identification and the Found Condition of the Painting, the original materials and technique of making the artwork are described, as well as its found condition and causes of deterioration. In the chapter Conservation-Restoration Research and Proposal of Works are described nondestructive and destructive methods research, and proposal of works.In the chapter Conservation and Restoration Works are described the entire treatment of the painting. Each procedure is systematically documented and described. The interventions are accompanied by written, graphic and photographic documentations.