One feature of SX-70 integral print film is its ability to be manipulated while developing, and for some days after.
Because the emulsion is gelatin-based, and the Mylar covering does not allow water vapor to readily pass, the emulsion stays soft for several days, allowing people to press and manipulate the emulsion to produce effects somewhat like impressionist paintings.
An example of this technique was used on the cover of Peter Gabriel's third self-titled album from 1980.
Another example of emulsion manipulation was the cover of Loverboy's debut album, Loverboy.

Greek-American artist Lucas Samaras created a series of self-portraits titled "Photo-Transformations" (1973-76) which employed extensive use of emulsion manipulation techniques.

The 500, 600, and Spectra/Image materials do not use a gelatin-based emulsion, and cannot be manipulated this way.

Manipulation of the photograph is best done about two minutes after the picture has fully developed.
It will stay soft and workable for about 5–15 minutes.
Some colors will be more difficult to work on (dark green), whereas others are workable for a long time (red).
If the photograph is on a warm surface or slightly warmed in an oven, image manipulation is made easier.
One feature of SX-70 integral print film is its ability to be manipulated while developing, and for some days after. Because the emulsion is gelatin-based, and the Mylar covering does not allow water vapor to readily pass, the emulsion stays soft for several days, allowing people to press and manipulate the emulsion to produce effects somewhat like impressionist paintings. An example of this technique was used on the cover of Peter Gabriel's third self-titled album from 1980. Another example of emulsion manipulation was the cover of Loverboy's debut album, Loverboy.
Greek-American artist Lucas Samaras created a series of self-portraits titled "Photo-Transformations" (1973-76) which employed extensive use of emulsion manipulation techniques. 
The 500, 600, and Spectra/Image materials do not use a gelatin-based emulsion, and cannot be manipulated this way.
Manipulation of the photograph is best done about two minutes after the picture has fully developed. It will stay soft and workable for about 5–15 minutes. Some colors will be more difficult to work on (dark green), whereas others are workable for a long time (red). If the photograph is on a warm surface or slightly warmed in an oven, image manipulation is made easier.
Polaroid SX-70