Polaroid type 55: how to have more smears on the negative, etc.?

I use Polaroid type 55 for the negative, and I would like to have chemical traces on the negative and also make the frame within the frame to stand out more. Do you have any knowledge as to how to obtain these effects. Likewise, how to get the Sabatier effect in a random way on the Polaroid type 55? I heard that pulling apart the film and then triggering a flash close to it would do it.

Many thanks for your answers. Awsiya.

overexpose and develop to completion for 10 sec in light or flash on the film while develop good luck