Table 3 Analyses performed on the four lithotypes samples and objectives

Colour change

colorimetry

Before/after treatment

all

all

After exposure

Cohesion, surface properties, penetration depth, interaction

SEM-EDX

Before/after treatment

Carrara marble, Savonniéres limestone

Florence, Cologne

After exposure

Cohesion, penetration depth, interaction

OM

Before/after treatment

Carrara marble, Savonniéres limestone

Florence, Cologne

After exposure

Cohesion

ScotchTapeTest

Before/after treatment

all

all

After exposure

Water absorption

capillarity water absorption

Before treatment/after exposure

Carrara marble, Savonniéres limestone (on selected samples purposely prepared)

Florence, Cologne