Interesting FP4+ observation

[Steve Goldstein]

Today I happened to open a newish roll of FP4+ in 120 size (expiry June 2023). Out of idle curiosity I held the silver exterior bag up to the window - and I could see through it! I could easily make out the details of the window curtain. And I could see strong light even through two layers.

After this discovery I fished a yellow plastic wrapping from a recent roll of TMY120 out of the trash. It was opaque under the same conditions.

From now on 120 FP4+ goes into a black container once it's removed from its little cardboard box.

 

[BrianShaw]

LOL... now what, exactly, inspired that investigation? I’ll have to try it with the FP-4 and Tri-X that I intended to use last month but never found the time. I wouldn’t worry as the backing paper provides adequate protection to the film. Very interesting observation!

 

[BradS]

What effect does Kryptonite have on you and your vision?

 

[Steve Goldstein]

LOL... now what, exactly, inspired that investigation?

The sun was in my eyes while I was sitting at my desk opening the package and the idea just popped into my head.

It’s certainly not something I’ll obsess about, and I know the backing paper alone is fully effective, but since I use black plastic containers anyway so the films don’t get crushed in my backpack after exposure I’ll just use them before as well.

 

[beemermark]

The backing paper on the 120 film protects it from light. The Mylar wrapper is to protect the film from moisture.

 

[RalphLambrecht]

The backing paper on the 120 film protects it from light. The Mylar wrapper is to protect the film from moisture.

one would expect for the silver mylar to do both.