ferrotype

fer.ro.type

n.（名词）
A positive photograph made directly on an iron plate varnished with a thin sensitized film.Also called tintype
铁版照相：直接在用感光底片上了光的铁盘上制成的相片正像也作 tintype
The process by which such photographs are made.
铁版照相法：制作这种照片的过程