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Kids will love playing spy games with these invisible ink spy pens. The pens come with safe and non-toxic invisible ink that can only be seen when you shine UV light from the cap of the pen on it. Write secret messages on paper, T-shirts, your skin, or just about any hard surface. The ink is permanent yet washable and flavorless. Makes great party favors, UV light comes with batteries. Pens are approximately 5.5 inches long. Write secret messages with our spy pens.
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Invisible/colorless in normal light. Glows bright blue in UV blacklight. Please note, these markers do NOT glow in the dark. You must have a
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Our Opticz Variety Kit includes both liquid ink and marker items needed to start your own secret message and security operations. Kit includes: (1) 4
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