1./ Ferro/tintype clones: direct positive, light density before a black
background (baryta, lacquer, etc.).
2./ Reversal processes (several).
3./ Negative/positive version. In this case the camera negative is a
silver bromide gelatin photopaper which is processing in the (big wooden)
camera. (As Robert <RNEWCOMB@uga.cc.uga.edu> described at: Fri, 06 Dec 96)
The ready (wet) paper negative is copying with the same camera by
a holder and (usually) a close up lens. The process is the same, and the
result is a (wet, low-quality) positive picture.
Some tips for identification.
The 1./ and 2./ are usually have reversed sides like daguerreo- or tintypes,
etc. (I mean ie. the left side of the picture is on the right). Both are
possible from portrait-automats also. In this case the paper is coated
(waterproof - with true resin layers -- not a plastic -- as I know from the
1910-s -- i.e. Fotomaton, an US. produced automat, with reversal processing).