What's the difference between ferrotype and melainotype?

Ferrotype

Definition:

• (n.) A photographic picture taken on an iron plate by a collodion process; -- familiarly called tintype.

Example Sentences:

• (1) In particular the 19th century produced images such as daguerreotype, collodion positive and the ferrotype.

Melainotype

Definition:

• (n.) See Melanotype.

Example Sentences: