How to see invisible UV Light – Easy At-Home Science

How to see invisible UV Light – Easy At-Home Science


Hi, I’m Tech Adams
Today, I wanted to show you this. To the naked eye and to the camera,
this piece of glass appears clear, but it’s not. Oohh, see how clear. In order to show that it’s
not clear, I need three things. A black piece of card,
a yellow highlighter, and an ultraviolet flashlight. The ultraviolet flashlight emits light primarily in the
ultraviolet spectrum, along with a little bit of visible
violet and blue light. The yellow highlighter contains
special pigments called phosphors, that react to ultraviolet
light and glow. When I put this piece of glass
between the source of ultraviolet light and the yellow phosphors,
the glow disappears. That’s because this is an ultraviolet filter,
it’s designed in such a way that the ultraviolet wavelengths
are absorbed while allowing all visible light to pass through. Glow, no glow, glow, no glow. Since the phosphors are glowing
in the visible range, putting the UV filter between the color and the
camera does absolutely nothing. While this particular filter
is used to remove ultraviolet light for cameras, similar ultraviolet
filters are used in sunglasses to protect the eye.
Nearly all sunglasses provide UVA and UVB protection
in part because of the overall darkening of the lens. Some eyeglasses have a UV coating. Some don’t. Don’t forget to like, subscribe, and share this video with your friends so that
they too can see the magic of the ultraviolet filter.
For Tech Laboratories, I’m Tech Adams, Saying “Keep Thinking” and
thanks for watching.

23 thoughts on “How to see invisible UV Light – Easy At-Home Science

  1. I was trying to find a way to test the spectrum to see if a light was putting off the uv spectrum and this will work so thank you (even though your title is a bit misleading). Keep up the good work! bossinovaresearchgroup.com

  2. Is this even ultraviolet? I get confused because I know we can't see uv. However things marked as UV we see purple and blue. Or at least I do and this is why I'm looking it up. However IR Infrared light is completely invisible unless an it lense or phone camera is used. This is why I am confused because I try looking it up. I do see light from a UV flashlight (not the UV light) but people say uv lights are invisible. So is he using a UV light or an IR light? And it's there true UV or false UV light being marketed as "UV lights" but they are just violet and blue LEDs? Seems like you can't get a straight answer

  3. I love this video it did help. Most of the people on here are just to simple minded to get it but I gave it a like it was amaze.

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