source: akaricenter.com
Your iPhone has a black light function. Did you know that? A blacklight is a purple-ish light that illuminates the character you wrote something with a fluorescent pen.
How to Make a Black Light.
source: YouTube
So it will me explain a simple recipe.
Prepare a blue and purple magic pen and cellophane tape as shown in the photo above!
1. Paste the cellophane tape next to the camera portion of the light.
source: YouTube
2. Then, paint the colour from the top of the tape using the blue magic pen as shown below.
source: YouTube
3. When the ink is dry, you can paste the cellophane tape again to superimpose the original mark.
source: YouTube
4. Use the blue magic pen to paint the colour from the top of the tape in the same way as was done in Step 2.
source: YouTube
5. Once again, let it dry and also superimpose the cellophane tape again in the same area.
source: YouTube
6. Now, use the purple magic pen to paint the colour on the same area as the blue magic pen.
source: YouTube
7. Please try to turn on the normal light settings of your iPhone on.
source: YouTube
8. It will emit a black light that looks like this.
source: YouTube
Surprising Things that Reacts with the Black Light.
So, there are many things that reacts with a black light and here are surprising things that reacts to black light.
Energy Drinks
Oronamin C:
I think the various components of nutrition is responding to the black light.
source: exblog.jp
Lipovitan D:
It is lit up by the black light.
source: exblog.jp
There are Exceptions
Dodekamin:
It is not lit up and it looks like there are some things that do not emit light via black light.
source: exblog.jp
Banana
The yellow sugar spots are seen clearly with a black light.
source: museum.tokushima
The others:
Delivery Pre-Postcard
Credit Card
Passport Photos of Faces
When I applied to things that are worrisome, there were some rainy day discoveries.
If you have ever considered buying a black light, I was very surprised that making one was so easy and inexpensive.