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QTY 2 INVISIBLE INK MARKING PENS WITH INCLUDED 365NM BLACKLIGHT Takes one AA battery (not included). This is the more advanced UV black light that can pick up pet urine stains, will light up holograms on drivers licenses etc.  It'll light up your invisible UV marker markings instantly, of course. A very good deal, actually. Markers sell separately for $10.85, that'd be $21.70. So you're getting the Blacklight basically for $2.25. ---------------------------------------- Info on markers below: -----------------------------------------

BLACKLIGHT ULTRAVIOLET U.V. MARKER

High quality, EXTREMELY PERMANENT INK

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U.V. ink lights up brightly under any blacklight,
But can't be seen in daylight or room light

Unlike most UV pens, this stuff is
very, very hard to wash off 

Works magically on:
Metal, glass, plastic, fabric, paper, wood, rubber, ceramics, and a long list of other surfaces

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Pleassssse note: 
Not for applying on skin

You're getting premium solvent-based ink, vs the more common water based UV ink.

Typical invisible UV ink and ink pens, being water based, are designed to rub off easily.
Not this ! You can get it off skin with a bit of work, but it'll take some religious scrubbing.

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This wondrous little pen can be extraordinarily useful over time, and may
pay for itself many, many times over if it helps you catch a fraudulent
online transaction, or retrieve stolen personal items.

It's filled with a proprietary ink formula that won't leave a trace, and is completely undetectable by the naked eye.

• Writes smoothly on virtually any surface- Secretly mark a liquor bottle if you think someone
(kids, for instance) is drinking from it

- Invisibly mark where an object, door, etc is resting:
it it's been moved, you'll immediately know

- Know for sure that the new mechanic you're using actually replaced a part:
simply mark your old one before repairs begin (and ask for it back)

BEFORE AND AFTER ..... HOW IT LOOKS ON GLASS

EASILY MARK YOUR STUFF IN CASE OF THEFT

Smartphones
iPads
iPods
iPhones

PDA's
Purses
Wallets

CD's
DVD's

Industrial manufacturing, marking and coding

Laboratory testing

Teaching / student demonstrations

Science experiments

Espionage (go ahead, laugh, it's part of superpower history)

- Kid detectives can write secret messages, draw spy maps for their friends

-Take notes you don't want other people to be able to read

- Mark returned items if you're an online seller

- Write computer passwords in invisible inks

-Magic tricks

- Many other uses not listed here, including uses you'll dream up on your own

MEDIUM POINT TIP

Brand new, of course. And ready for action !

BITS OF TRIVIA :
Apparently part of the plot of the movie 'Da Vinci Code' involved the use of a UV marker.

And, in 2002, a multi-prison uprising was organized using UV markers. Uh oh.

QUESTIONS FROM PAST BUYERS
And, just maybe, a few answers

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Question :

Hello, this really seems so neat. can you put this on clothing and then
wash it without it coming out or fading all over the material ?
Thanks so much, Angela

Reply :

Hey there Angela !

Yep, will work just fine on fabric, and can't say that with 100% certainty on
all the many types of fabric out there, but it's quite unlikely it'll wash out of anything.

Hmmmm.....maybe it'd fade over a hundred washings, but again, not likely by very much.

Your best bet maybe is just try one pen only and experiment so you get a better idea
of real-world results.

Do keep in mind, too, that some natural white fabrics (cotton for instance) already
contain UV phosphors in the weave (which is why some T-Shirts glow in a
night club). Same thing for teeth. Sooooo.... UV ink won't show as well on white cotton.

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Question :

Hi, I recently purchased a handheld black light, a keychain black light and a black
light pen from you. I just tried out the pen on regular paper and
it doesn't seem to work.
Thanks, Frank.

Reply :

Nothing wrong with your pen at all, as it turns out.
I wondered how this could be, so ran some tests here, and realized something fundamental.
That is, that some type of white paper (though not all) contain natural fluorescent phosphors (present
in cotton, also in white t-shirts, your teeth, etc, which is why they glow under
blacklights at a party).

As a result, the invisible ink itself becomes invisible on bright-white
phosphor-containing surfaces because the entire surface itself responds to UV,
so it's then impossible for the ink to stand out as there's no contrast (like a piece
of white paper in snow).

Consequently, it's not just this pen, but no UV invisible pen or ink anywhere in the
world would be able to be used on white cotton-containing paper (like inkjet paper).

I did try it on a variety of other colors and it works fine.
Even on white cardboard. But on the white inkjet paper I used,
it doesn't show, so you can bet that was cotton laced paper.

Question :

I'm a seller online and think I am getting scammed by a
few bad apples, so think it is time I started marking certain
pieces of my jewelry. Hopefully this will help protect me."
Thank ! Karen

Reply :

Should do the trick Karen, best wishes !

Question :

Thank you people, the pen is cool
James.

Reply :

No....... thank YOU !

Blacklight eBay store UV Pen Quantity Discounts