Okay...I'm sure it's probably true for the Type-55 [negative] in the darkroom....unspread goop yields black on my darkroom prints from the Type 55 negative.
I finally found an example showing 'empty white' on a Polaroid [positive].
However, the post doesn't indicate the specific type of Polaroid film.
Also, If the chemical pods dry out or break on the Fuji pack films available today,
same thing...blank white.