Why are they called sorcerers mirrors?

The curved surface distorts perspective in a manner that historically fascinated scientists and magicians alike. People once believed the unique optical properties could detect unseen spirits in a room. This folklore led to the alternative name, linking the functional household object to early scientific curiosity and domestic superstition.

How do I date an antique convex mirror?

Examine the construction of the wooden frame, the composition of the gesso, and the character of the glass plate. Regency pieces often display bold classical motifs and heavier proportions. Later Victorian and twentieth-century revivals tend to simplify these elements or utilise different backing materials and modern fixing methods.

Are all convex mirrors circular?

The vast majority of traditional examples feature a distinct round format, often housed within a heavy circular frame. Oval variants do occur occasionally in later revivals. Circular frames remain the standard form across both English Regency pieces and French nineteenth-century imports.