What type of Picture is this

[johnschlicher]

I bought this at a local flea market this week end. It is a 14 x 17 glass plate picture, on the back it looks like brown paper, but if you hold it to a light it looks almost like it is in color. Thanks John

[David A. Goldfarb]

Hand colored ambrotype, maybe, or something of that nature.

[johnschlicher]

I didn't realize they made them that large