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.

Step 1: 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.
<p>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?</p>
<p>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).</p>
<p>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?</p>
That guy in the picture,is it you?
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
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.
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? Wait...you want my account deleted?
It was a warning - you have posted &quot;smart&quot; 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 <em>my</em> orangeboard.<br/><br/>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.<br/><br/>If, instead, it was an attempt at simple humour, then I am sorry, but it failed.<br/>
fail,I had to say that because you don't need a long comment to get such a simple point out
Like I said, <em>I</em> am treating <em>you</em> fairly - part of that is explaining what you are doing wrong.<br/>
Ok,thanks,for nothing,Big time
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?
<a rel="nofollow" href="http://en.wikipedia.org/wiki/Baconator">Pardon?</a><br/>
Nonononono - <a rel="nofollow" href="http://www.instructables.com/group/baconators/">baconators.</a><br/>
Oh! No, I don't think it <em>quite</em> falls within their remit...<br/>
Well, it's meant for general harassment help, not <em>just</em> suggestive comments, although that's been the bulk of complaints.<br/>
Have you <em>had</em> a lot of &quot;business&quot;?<br/>
Not bucket-loads, fortunately, but we have had some...
I've noticed (quite by accident) that some blue LED's have enough UV component to illuminate blacklight makeup.&nbsp; cool effect--maybe safer?<br />
Very cool!
why worry about UV rays just use IR LEDs
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?)
Actually,Your eyes arent sensitive to UV light,its your skin that is sensitive to it.
You can't <em>see</em> it, but you are <em>sensitive</em> to it - UV light can cause a form of blindness known as &quot;welder's eye&quot;, and repeat exposure increases the risk of cataracts.<br/>
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.<br />
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).<br /> <br /> <br />
Ah okay, I forgot to mention the paper has sections of &quot;glow in the dark&quot; pigment but I'd imagine that these do something similar in terms of absorption and re-emittion.<br /> Thanks,<br /> Drew<br />
Exactly.<br /> <br /> Good luck, don't forget to document it.<br />
May be a while yet because I'm still trying to figure out how to make the pulleys (gearboxes are too noisy).<br /> Thanks,<br /> Drew<br />
Umm...yes it can. You could probably keep your eyes open,just as long as you don't use this in a daily basis.
I made an invisible costume once, all I did was rap myself in plastic wrap! (Sadly was arrested...) <br /> (No,just joking around...)<br />
You could go out and get yourself some 100% UV blocker sunglasses, and then draw on those with the markers to give it a cool effect
cool leatherman
Most traditional "highlighter" pens available anywhere (try your desk drawer or all those mugs full of pens on "that thar shelf") fluoresce under ultraviolet radiation of a fairly wide range/bandwidth. I know most of these are don't tend to be tricky to get off your skin. Some of them contain some evil solvents though, so use with caution -- generally if it reeks to high heaven it's not going to do your skin any good at all! I hate how even the sweet-sickly (delicious) smelling solvents are bad for you. Such a shame 8-( lol They are slightly visible in daylight however (perhaps it is best to use them after dark, well -- duh!) -- "daylight" has oodles of UV in it, thanks to that childishly-drawn big fat orange/white ball of multi-form energy we apes generally refer to as the sun. 8-)
Forgot to add the (seemingly obvious) point that highlighters are made easy to spot and bright by absorbing UV radiation and emitting it into the human visible light spectrum. There we go 'ible'ers some educational crap for the day. Have a good 'un! Be sure to check out Kiteman's other instructables, he's a valuable member on here! 8-)
to be fair tv is awsome these days
Highlighter pens also work - not so invisible, but an option to further the design approach.
wow, this is a great idea kiteman! cant beleaved i missed it. im now trying to think of a way to do this with something othere than uv leds, the only other thing is to use lasers.. which is going to do more damage.
Check out the comments below about diffusing the LEDs - that's probably a big improvement to the idea.
yes i did have a read. Im still thinking about it...
aha! now, am i right in thinking that high density LEDs wont cause any problems with eyesight. Then instead of uv pen, use glow in the dark face paint. Then, you will appear normal, until you super charge the glow in the dark paint.

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