Smithsonian Report, 1963. — Gettens 



Plate 4 



I •\ 



The corrosion crusts on the stem of this old Persian lamp (25 cm. high) made of leaded 

 bronze contain rare mineral salts of copper and lead. Some clusters of the distinct 

 mineral crystal forms found in the crusts are shown in detail in plate 5 opposite. Freer 

 Gallery of Art, SC. 541. 



