The master's thesis describes the conservation-restoration treatment of the wooden objects Mini-relief 8 and Dimetrodon by the artist Ljerka Šibenik. The use of new painting materials such as fluorescent acrylics and the fact that the objects consist of the monochromatic surfaces greatly influenced the choice of materials and methods used in the conservation- restoration procedure. For better understanding of the entire concept of conserved objects, an interview with the artist was conducted as part of the master's thesis. Mini-relief 8 is a relief that Ljerka Šibenik made out of wood in 1968 and consists of two elements; one is blue and the other fluorescent pink. Dimetrodon is a sculpture consisting of three elements made of chipboard, connected with hinges. It was created in 1968 as well, and painted with orange, green, pink and red fluorescent colors. Both sculptures are in the collection of the Museum of Contemporary Art (MSU), Zagreb. The conservation-restoration treatment of both sculptures included research, analysis of material composition, cleaning, reconstruction of the wooden support, ground layer and paint layer. As part of the research, a stratigraphic analysis of the paint layer and FTIR spectroscopy were performed and the results confirmed acrylic paint. Cleaning was the most demanding phase of the entire conservation-restoration procedure because monochromes are extremely sensitive surfaces and even the slightest change impairs the viewer's experience of the artwork. In order to remove surface dirt on all surfaces of both objects, a solution with Triton XL-80N surfactant pH 6 was used, bearing in mind that the surfaces are not soaked but lightly rubbed with a barely wet nano sponge. Only the green surface of Dimetrodon was cleaned with a microemulsion composed of silicone biodegradable solvent D5 and 10% citric acid solution, pH 6. The removal of the unprofessional retouch from Mini-relief 8 was performed mechanically with a scalpel. The reconstruction of the wooden support on the two elements of the Dimetrodon sculpture and on the Mini-relief 8 is made with Araldite putty with wood sawdust as a filler. For the reconstruction of the ground layer, Jubin Akrilin, acrylic based putty for wood in white color was used. Kremer pigments bonded with 7% solution of Klucel in distilled water were used for reconstruction of the paint layer.