Thesis: Ke-An Chiang

The Efficacy of Micro-Abrasive Cleaning for Historic Brick: Investigating Graffiti Removal and Surface Changes

Removal of graffiti from porous masonry structures poses significant conservation challenges particularly with spray paint, due to adhesion properties and penetration within the pores. Historic brick, generally softer and with a higher porosity compared to dense stone or modern brick, is particularly vulnerable to paint absorption and susceptible to surface alteration as part of the removal process. Micro-abrasive cleaning, which employs fine abrasive particles at low pressures to wear away the paint, offers a controlled alternative to other methods, reducing direct exposure to harsh chemicals, discoloration, and excessive material loss. However, its effects on historic brick remain underexplored.