X-Rays made with scotch tape (2008)

Previously:

• 2008: https://news.ycombinator.com/item?id=340644 (3 comments)

• 2009: https://news.ycombinator.com/item?id=821322 (9 comments)

• 2010: https://news.ycombinator.com/item?id=1782795 (7 comments)

• 2012: https://news.ycombinator.com/item?id=3528680 (1 comment)

• 2015: https://news.ycombinator.com/item?id=10174648 (13 comments)

• 2018: https://news.ycombinator.com/item?id=17057786 (11 comments)

I would see this phenomenon when taking medium format film off the paper backing in a darkroom to load for processing.

After a while I'd notice a faint blue light coming from the masking tape as I peeled it off the paper and film and I never figured out what that light was!

Now I know.