Impossible black and white film for the Polaroid SX-70 seems to be a little more sensitive to light than it should be. This can lead to some nice luminous highlights, as in some of my previous instant shots. A lot of the time however it simply results in photos that are totally over-exposed. This one was taken with the exposure compensation dial set to the darkest position.
This was processed a little in Lightroom, mainly for contrast and the blacks.