Tried following the OP's link but kept ending up at James Randi Educational Foundation
I think I have proof of the supernatural. My darkroom is possessed.
Neither selenium intensification, new coccine retouching, condenser head light nor dodging and burning could bring out the detail in my negative from the 4x5 negative of the happy couple's first dance. So I tried another happy couple's first walk and the 4x5 condenser wouldn't cover 6x6. The siphon broke twice, at least the floor's clean, twice. But the drymount press, vacuum pump and voltage stabilizer did not need washing. Twice.