*2.3. Mock-Ups*

Pieces of modern terracotta were acidified by covering with 6N hydrochloric acid (HCl) and allowed to dry at least overnight before painting. Each piece was painted with a swatch of cadmium orange and cadmium orange mixed with Titan Buff, mimicking the mixing of the paint in the conservation treatment. Non-acidified pieces of terracotta were prepared for direct comparison to the acidified pieces. The mock-up pairs were used for experiments to recreate the formation of the calclacite efflorescence and to investigate the role of light in the alteration of the cadmium orange paint layer. A final mock-up treated with 1N HCl was also produced to compare with the mock-ups treated with 6N HCl. The mock-ups were sampled as needed for preparation as cross-sections, as well as analysis by FTIR, pyrolysis-GCMS and SEM-EDS. Raman analysis was performed directly on the mock-ups.
