Due to the way that instant film develops, several techniques to modify or distort the final image exist, which were utilized by many artists. The 3 main techniques used are SX-70 manipulation, emulsion lift, and Image transfer. SX-70 manipulation is used with SX-70 Time Zero film and it allows the photographer to draw on or distort an image by applying pressure to it while it's developing. With an emulsion lift, it is possible to separate the image from the medium it developed on, and transfer it to a different one. Image transfers are used with peel-apart film, like packfilm, to develop the instant image into a different material by peeling the picture too early and adhering the negative onto the desired material. Polaroid encouraged the use of these techniques by producing videos about them.