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On the side, you might see a slightly brighter line. Here's an xray of a uSD card:

http://rusolut.com/wp-content/uploads/2014/02/msd1xray.jpg

And an xray of a rubiks cube:

https://c1.staticflickr.com/5/4138/4859926370_10d2a0d071.jpg

Overall, doubt you could see it without looking very carefully.

I just had some teeth X-rays at a pretty regular dental clinic here in Taiwan. They were showing me the results and explaning what they have found. I was totally amazed how thing that look super-light tiny shadows for me at one place they say "we must check", while elsewhere they were "nothing". What you see totally depends on the expertise you have and I think it wouldn't be hard at all to spot things that for us outsiders are just "maybe a little bit lighter".

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