Conserving an Ottoman Helmet

Recently, while re-installing one of the exhibition cases of Islamic arms and armor, conservators noticed bright green corrosion around the copper rivets on one of the helmets. What was causing this corrosion, and could it be stopped?

Helmet engraved with floral patterns, before conservation treatment. Sixteenth century Ottoman Turkish or Persian. Walters Art Museum 51.1, acquired by Henry Walters, 1911.

Recently, while re-installing one of the exhibition cases of Islamic arms and armor, conservators noticed bright green corrosion around the copper rivets on one of the helmets. What was causing this corrosion, and could it be stopped?

Detail of corrosion on copper rivets, before conservation treatment.

The helmet engraved with floral patterns (WAM 51.1) was made sometime in the 16th century in Turkey or Persia (modern day Iran), and was purchased in 1911 by Henry Walters. A circular mark cut into the proper right side of the helmet indicates that it was once part of the Imperial Arsenal of the Ottoman Empire in Istanbul.

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