Thin bowl, copper alloy - Cu Alloy - Early medieval times

Complementary information

Mechanical cleaning with soft brushes and tapwater. Stability of the metal was checked in a humid chamber and active corrosion apeared after two days. The corrosion appeared in pits and was powdery and light green in colour. Probably bronzedisease. The artefact was carefully cleaned and plased in etanol for two weeks and further drying in an oven at 50 degrees for one week. Surfacetreatment with BTA and Paraloid B42.