O.k. So I have noticed that on B/W Polaroid sheet film, I was getting a readable "negative" opposite the print. If I was careful and let it dry, I actually got something that could be scanned into my PC, reversed in PShop and used. The look was old and arty and had some interesting aspects to it.

I did this with 400 and 800 speed films. But recently I tried the same with some 100 speed and I got NOTHING on the opposite side. Just black. Good positive, no "negative".

Anyone know if this is enedmic to the type of film used or maybe something else? I will say that with the 800 and 400 speed I developed at 40-45 seconds due to temp as opposed to 60 seconds for the 100 due to temp.