leewaybe careful throwing tomatoes at bronze statues or plaques, it causes a chemical reaction with the copper that causes irreversible decay and corrosion known as "bronze disease". seawater and other solutions containing chlorides can have this effect too. you wouldnt want to inexorably ruin any statues, so be very careful.
&Kalmia@leeway Hydrochloric acid is also fairly easy to find and does a rather vigorous reaction, a sufficient quantity can even make it structurally unstable overnight.
So be sure to not get any on the base of a bronze statue, it could fall and be an embarrassing moment!
frongus by scrongus