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QTQYQJ 20pcs Invisible Ink Pen,Upgraded Spy Pen Invisible Ink Pen with UV Light Magic Marker for Secret Birthday Message Party,Writing Secret Information Easter Day Halloween Christmas Party Bag Gift

Brand: QTQYQJ
  • Spy Pen:The ink is invisible after you write with it,unless you light on the cap blacklight to see the secret message perfectly.This magical invisible ink pen allows you to write down your secret information and hide it,spy gear for kids
  • Invisible Ink Pen With UV Light:Harmless and tasteless ink, healthy toy for your kids! Smooth and colorful disappearing inks on t-shirts, paper! Permanent but washable! With 20pcs in the bag, you can easily host a kid's birthday party favors stocking stuffer, treasure hunt,escape room,or classroom activity complete with invisible ink clues
  • Great Gift for Fun Party Favors:Our invisible spy pen can write your secret in the sticky note. Different colors make the activity more exciting and entertaining. Parents can buy it for their kids party at home. Kids love using this kind of pen to keep their secret and play detective spy games. Schools, teachers can buy it for students for a school activity. Add it for any surprise gift bag or as a kids stocking stuffers
  • Package Includes:20 pcs(random color) invisible magic pens with built-in UV lights. Batteries included and installed.they each had a pull tab to save battery life. Pens will be available in multiple colors to keep the activity exciting.Be careful with small items: children over 3 years
  • Buy with Confidence:We consider our customers as our top priority. Please contact us if there is any problem.(Note: The ultraviolet light visible to the naked eye is light blue-violet.)
Brand: QTQYQJ
Size: 20 count (Pack of 1)
Color: [Multiple]
Manufacturer: QTQYQJ
Part Number: GB5W7GP
Isin: IQS8ZN6RAMXB

$46.21

  • Free shipping in US
  • Shipping: $14.5 Extended Delivery (Ships from overseas warehouse, 10-15 Business Days)
  • Arrives:

  • Free 30-Day returns

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Sold by , Fulfilled by IBSPOT
Ships from USA

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QTQYQJ 20pcs Invisible Ink Pen,Upgraded Spy Pen Invisible Ink Pen with UV Light Magic Marker for Secret Birthday Message Party,Writing Secret Information Easter Day Halloween Christmas Party Bag Gift

QTQYQJ 20pcs Invisible Ink Pen,Upgraded Spy Pen Invisible Ink Pen with UV Lig...

$46.21

About the wavelength of our lamp. We use lamps with a wavelength range of 420 nm-425 nm What is the principle of making the invisible ink appear. The ink we use is invisible ink. After you write, it will slowly disappear until you can't see the content of the writing. Then you need to press the pen to turn on the light to make the light glow, and use the light to observe what you write. The results of our experiment shows that the use of ultraviolet lamps with a wavelength of 420 nm-425 nm allows us to clearly see the disappearing ink, so the wavelength range of the lamp we use is 420 nm-425 nm Is there a child in the world who doesn’t like the idea of sending secret messages in invisible ink. I haven’t met one yet. These pens will be a hit with any child who can write and who enjoys making up their own games. It’s the simplest thing but it really is fun. These would be a treat for kids who like secret spy games, crime-solving or super-hero games, for those who like passing secret notes or leaving clues that only certain people can see. Write notes with these pens and the words disappear almost immediately. But there is a special light at the other end of these pens. Anyone who has one of these can shine that light on the page where the invisible message was written and – voilà! – the message appears! I think these would make brilliant party favors or Valentines Day gifts. I’ll bet teachers could find lots of ways to use them in the classroom and they’d also make terrific end-of-the-school-year gifts to encourage kids to practice handwriting and spelling over the summer

 

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