Well, well, well....
There is no paper fog at all. The paper has no defect.
The blue color of the processed paper can be washed off, washed away, or washed out, or whatever you want to say it. I tried some strips with 2 minutes RA rinse and the blue color did go away completely, as it supposed to be. The un-exposed 1/2 strips are white color, just as the previous batches.
It is just a simple blue/cyan top coating get washed away during pre-rinse. I do not understand why people made it so complicated....

Adv Reply