Disappearing Fountain Pen, Spy Pen, Disappearing Ink Pen, Write Secret Messages Secret Party for Writers UV Fun Activities and Gifts for Kids Creations (10Pack)

The ink really appears in blue light only, available in the same pen, not visible in normal light

Very interesting technique, my children's love to play with these pen & its very good to enhance learning as well as playing abilities in the children's. First they think then write & then ask from each other what I wrote & when they correct tell also get a gift.Means children's playing like this and enjoyed a lot & one more thing you can only see after written when you put light on that which is available at the back side of the pen.

حلوين