Cross-Eyed

While the "Bleach-Bypass" process skips a step to get a fresh new look, "Cross-Processing" uses the wrong chemicals altogether to create some very interesting tonalities in photographs.

Cross-Processing is a technique that involves deliberately developing a film in chemistry designed for a different type of film. For example, developing C-41 color negative film using the the E-6 transparency (slide) film process.

The results depend upon which process and film are used of course, and there are almost limitless possibilities, but the two most common types of Cross-Processing are:

1) Developing transparency (slide) film using the C-41 process. This produces a negative image on a colorless base.

and

2) Developing color negative film using the E-6 (transparency) process. This results in a positive image on an orange color film base.

Generally, Cross-Processed prints have unnaturally twisted colors and high contrast. There are many optional tweaks that can be performed too, such as bleaching to create a pastel-like effect.

As in all good old-time tricks, this one can be reproduced digitally, and it's a very, very popular look right now.