Picture of Get the LED out: The Invisible Costume.
You want to dress up for a fancy dress party, and you want to arrive in costume, but you need to cross town without drawing attention to yourself.

Enter the Invisible Costume.
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Step 1: The Gimmick

Picture of The Gimmick
This Instructable uses UV LEDs built into a hat of your choice to reveal facial decorations drawn in UV security markers.

Health and safety

I have been unable to find official HSE data on the use of UV LEDs near the face. Since strong UV light can cause a semi-permanent to permanent condition known as "welder's eye", I would strongly advise that anybody who uses this project does so with their eyes shut when the LEDs are switched on.

This advice is from The LED Museum :

Most sunglasses and some prescription eyeglasses have some degree of UV protection already; to determine if yours do or not, aim the flashlight at something that clearly fluoresces (such as those neon green & orange stickers that occasionally show up on your mail, day-glow orange price tags, or painted portions of a blacklight poster), positioning the light so the object in front of it glows (fluoresces) brightly from the ultraviolet light. Then put the glasses between the face of the light and the target. If the glow stops or dims dramatically, the glasses are stopping the UV and you can use them as eye protection at least for short-term use.
However, if the glow remains or dims only slightly, look for another pair.

In any case, never look directly at the LEDs without eye protection - not even for a minute.

Symptoms of UV exposure may not appear immediately; they can be delayed by 30 minutes to several hours. They can include a burning or "sand in the eyes" sensation, and a hazy look around light bulbs and other bright objects. Mild cases are self-correcting within 24 to 36 hours; however if despite my warnings you still stared at this light from close range for more than a few minutes, it might not be a bad idea to see an eye doctor and tell him you've been exposed to UVA radiation.

DISCLAIMER: I shall not be held responsible for any damage or loss of eyesight arising from your use or misuse of the information on this page. Thank you for listening.

UV security markers are not designed for use on skin, so users should also check for sensitivity by applying the marker to the inner wrist and waiting 24 hours to see if there is any irritation or allergic reaction.
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stacker5517 days ago

you said that it took you ages to arrange the angles because you had to take pictures and use pictures to try and adjust them. why question is why didnt you just use a mirror?

Kiteman (author)  stacker5517 days ago

Because I didn't have one. I was in the shed, my mirror is screwed to the bathroom wall (we don't have lots of mirrors, we're not a vain family).

stacker5517 days ago

you said that it took you ages to arrange the angles because you had to take pictures and use pictures to try and adjust them. why question is why didnt you just use a mirror?

ReCreate5 years ago
That guy in the picture,is it you?
Kiteman (author)  ReCreate5 years ago
What do you think?
Hey,is that your shed? Your in your shed,right?
ahaha, i just saw this comment. I used to talk so dumb. xD
Kiteman (author)  ReCreate5 years ago
Why the "?"?
Well,He looks a bit like the cartoon in your avatar,and he looks a bit stubborn,kinda like the guy called "Mr.Smarty pants"... Well,I don't think i have ever seen you in any instructable before.
Kiteman (author)  ReCreate5 years ago
Keep it up, RC - stalking and insults are two good ways to get your account deleted.
i didn't mean to insult you,it was a part-joke,don't you have a sense of humor? want my account deleted?
Kiteman (author)  ReCreate5 years ago
It was a warning - you have posted "smart" comments on a lot of my old comments, and started doing so as soon as I started dismantling the anti-evolutionary nonsense you insist on posting on my orangeboard.

I believe I have treated you fairly so far, but your actions smack of personal challenge, petty revenge for my failure to roll over and believe theist lies.

If, instead, it was an attempt at simple humour, then I am sorry, but it failed.
fail,I had to say that because you don't need a long comment to get such a simple point out
Kiteman (author)  ReCreate5 years ago
Like I said, I am treating you fairly - part of that is explaining what you are doing wrong.
Ok,thanks,for nothing,Big time
Kiteman (author)  ReCreate5 years ago
Any time.
wow this is like reading a very poetic and weird drama non fiction/fiction book oh and remember its good for your brain!!!!!!
Shall I call out the baconators?
Kiteman (author)  Lithium Rain5 years ago
Nonononono - baconators.
Kiteman (author)  Lithium Rain5 years ago
Oh! No, I don't think it quite falls within their remit...
Well, it's meant for general harassment help, not just suggestive comments, although that's been the bulk of complaints.
Kiteman (author)  Lithium Rain5 years ago
Have you had a lot of "business"?
Not bucket-loads, fortunately, but we have had some...
grannyjones4 years ago
I've noticed (quite by accident) that some blue LED's have enough UV component to illuminate blacklight makeup.  cool effect--maybe safer?
Very cool!
wakojako5 years ago
why worry about UV rays just use IR LEDs
Kiteman (author)  wakojako5 years ago
The idea is not to disguise your face with light, rather it is to illuminate the face and make invisible make-up suddenly show up.
use ir paint.(does it exist?)
ReCreate5 years ago
Actually,Your eyes arent sensitive to UV light,its your skin that is sensitive to it.
Kiteman (author)  ReCreate5 years ago
You can't see it, but you are sensitive to it - UV light can cause a form of blindness known as "welder's eye", and repeat exposure increases the risk of cataracts.
andy Kiteman5 years ago
I'm using UVLEDs for another project. Are there any rules of thumb that you know of for dealing with this type of UVLED (safely)? I appear to have the same type as you have used in this tutorial and I'm concerned that repeated exposure could cause undue damage to eyes. In my application the full LED light would be reflected from a paper surface and present on a wall typically at least a meter from others.
Kiteman (author)  andy5 years ago
You should be safe enough - chemicals used in most white papers absorb UV and re-emit it as a pale blue (it's an optical illusion to make the paper look whiter, like washing powders).

andy Kiteman5 years ago
Ah okay, I forgot to mention the paper has sections of "glow in the dark" pigment but I'd imagine that these do something similar in terms of absorption and re-emittion.
Kiteman (author)  andy5 years ago

Good luck, don't forget to document it.
andy Kiteman5 years ago
May be a while yet because I'm still trying to figure out how to make the pulleys (gearboxes are too noisy).
Umm...yes it can. You could probably keep your eyes open,just as long as you don't use this in a daily basis.
JohnJY5 years ago
I made an invisible costume once, all I did was rap myself in plastic wrap! (Sadly was arrested...)
(No,just joking around...)
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