[AndyG]

For the life of me, in any angle of light, I cant find a scribed SN under the slide.
Andy

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[AndyG]

Better pics

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[Pancho]

Andy,
I think atomic energy provides the best light for this purpose.
I suggest a natural source, like the sun.
The alternative would be so messy.
Here's a link which might be helpful, and importantly, ammusing.
Pancho

http://www.panchogun.com/FVWebPhotos/FV-Instructional-Walther-SCRIBES-5x100px.jpg