This thesis investigates the original materials and current condition of the 1966 pigmented stucco mural on the silo at the Wharton Esherick studio, the final architectural addition by American modern wood master Wharton Esherick. The study reviewed all architectural projects Esherick participated in, revealing that the silo’s design and use of pigmented stucco represent a culmination of his previous architectural experiments. Combining scientific analysis and archival research, the study aims to identify Esherick’s materials and techniques while proposing appropriate conservation treatments. Through XRF, FTIR, Raman spectroscopy, SEM-EDS, petrography, and cross-sectional microscopy, the analysis revealed a hybrid lime–Portland cement stucco base pigmented with ultramarine, chrome oxide green, red ochre, and yellow ochre. A comprehensive condition assessment identified surface erosion, moisture infiltration, and weakened cohesion, which prompted the exploration of potential consolidants. Four inorganic consolidants—nanolime, TEOS, calcium oxalate, and potassium silicate—were selected for their compatibility and capacity to enhance surface strength. Future testing will include mockup fabrication and in-situ trials to evaluate the long-term performance of these treatments. This research contributes not only to the preservation of Esherick’s unique work but also provides a framework for the conservation of mid-20th-century murals made with experimental materials in outdoor settings.