Portrait miniature, untitled, by T. C. Thompson

Portrait miniature, untitled, by T. C. Thompson

Portrait miniature
Untitled
T. C. Thompson
19th century
Watercolour on ivory
Museum no. P. 22-1928

Efflorescence of crystals on the paint layer. These crystals consist of magnesium phosphate, which is a natural constituent of ivory and were caused by high humidity. The miniature was already in this condition when acquired by the museum in 1928. The right hand side of this miniature has been treated using micro-crystalline wax to change the refractive index so that the crystals become less visible.