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TutorVeritatis — Historic graffiti
Published: 2013-06-29 05:12:06 +0000 UTC; Views: 48; Favourites: 1; Downloads: 0
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Description
Found in Fort Point NP, on a discreet wall in an archway. But if too many people take pictures the writing will fade. So don't take pictures with ultraviolet light. Use filters instead.Related content
Comments: 13
.... why would a camera's flash bulb have UV?
Old graffiti is awesome
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white light is UV. A lot of old art is damaged by constant light exposure, whether to sun or a continuous stream of people taking pictures.
I hope it is old, the location is not exactly secret nor is it protected. It's just open, the only thing hiding it is shadows.
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Can't you have white light without UV though, using only the spectrum of light visible to humans, cutting out UV and infrared light....
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Infrared would be fine but the whole white spectrum is just dangerous overall to the longevity of written items. Have you ever been to Washington DC, the National Archives? Have you seen any movies which showed the Constitution?
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Ok 
And I haven't ever been to DC (I live almost on the exact opposite side of the country from there, the other Washington XD ) And I'm afraid that human history isn't one of my greater interests 
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No matter. Anyway, the National Archives houses the Constitution, Declaration of Independence and Bill of Rights. In earlier decades the documents were on display and sunlight damaged the text.
So that's why I give caution to UV light on text because, over time, the words will fade with constant exposure, even brief camera flashes. Infrared is certainly better.
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Also good for reading maps at night or stargazing. Maintains the natural night adapted vision one gets in darkness. Although to have some high grade goggles would be awesome.
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Easy enough to get away from if you head inland and into some mountains, even small ones.
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Yep, my family is going camping in a couple weeks, and I'm looking forward to seeing stars and bats and large insects and stuff
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Sounds fun! Getting away from all of the technology and stench of cities is relaxing.
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