Cute Invisible Ink Pen With Ink Revealing LED

LED - Light Emitting Diode - a small light source

Ink - A liquid containing pigments and dyes

UV - Ultraviolet - a specific wavelength of light invisible to the human eye

Ultraviolet - UV - a specific wavelength of light invisible to the human eye

Invisible - Something that cant be seen by the human eye

marker pen - A pen with its own ink source and tip usually made of pressed fibres such as felt or nylon.

water - A chemical substance. Chemical formula H2O.

Normal - often relating to someone or something that is average.

LED - Light Emitting Diode. A bulb that is very efficient at producing light. Often small.

Permanent - Something that is long term and most likely to be around forever.

Resistant - Something that can repel against something.

Specification - A description of a product with the details of its attributes.

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