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How to create a black light?

Published in DIY Projects 2 mins read

You can create a makeshift black light using a flashlight, blue and purple markers, and tape.

DIY Black Light Method

Here's a step-by-step guide, based on a reference, to create a black light:

  1. Gather your materials: You will need a flashlight, blue and purple markers, and clear tape.
  2. Apply the blue marker: Using the blue marker, color the lens of the flashlight. Be generous with the ink.
  3. Apply the tape: Place a piece of clear tape over the marker.
  4. Apply more blue marker: Add another layer of blue marker over the tape.
  5. Apply more tape: Again, put another piece of tape over the second layer of blue marker.
  6. Apply purple marker: Color over the tape with the purple marker.
  7. Test: Turn on the flashlight, and it should emit a blacklight effect.

How it Works

  • The blue marker acts as a filter that absorbs most of the visible light except blue and some violet colors.
  • The purple marker further filters out some of the visible light, mostly leaving ultraviolet (UV) light that makes some materials glow, mimicking the effects of a black light.

Additional Insights

  • The effectiveness of this homemade black light depends on the quality of the markers and the type of flashlight used.
  • This DIY version will not be as powerful as a commercial black light but serves as a fun and easy way to explore the effects of UV light.
  • The intensity of the UV effect can vary with different marker brands and shades.
  • If you want a stronger effect, consider repeating the layering process with more coats of ink and tape.
Step Description
1 Gather the materials
2 Color the lens with blue marker
3 Apply tape
4 Add more blue marker
5 Apply tape
6 Color with purple marker
7 Test the light

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