6 ½ x8 ½ Sun Proof Holder

Description

Wood frame holder used to make sun proofs from Printing Out Paper by sandwiching the negative with the paper and laying out in the sun sometimes several minutes.
This made the red proofs that were not permanent in the old photo studio days.
Image just kept getting darker as it was looked at.
If placed in the dark would last maybe a week.
Condition is good and would be great for someone’s collection.