I have some Polaroid Type 51 4x5 sheet film on the way, this is high-contrast black and white positive/negative film. About 30 years old. I'm fully aware that I might get nothing from it but the price was right at less than $1/sheet, compared to the $5-10 or more per sheet that the more recently expired stuff is fetching. Any tips for shooting film this old?

I have heard 1 stop per decade for old roll film but I'm not sure if this would apply to Polaroid.

In any case it should be interesting...