Cave entrance, natural light

Alterations observed: 

green patina, red and black spots

Close to the entrance, 

artificial and natural light

Sample type: limestone

Alterations observed:

green patina

Dust deposition on the

limestone, artificial light

Sample type: limestone

Alterations observed: 

green patina, black spots

Water percolation on the wall. Artificial lamp

Sample type: limestone

Alterations observed: green patina

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