Find out how to fill a PenInk Intelligent’s PhotoCat Pens provide a quick, easy and reliable method of checking whether a surface is photocatalytically active; effectively making the invisible visible!
When the ink from the pen is exposed to ultraviolet light (UV)* it will change colour, but only if it is on a photocatalytic surface. There is no reaction if the ink is drawn onto any other surface. The video below shows a side-by-side comparison of the ink on a normal piece of glass and on a commercial photocatalytic glass.
The PhotoCat Pens work on a wide variety of photocatalytic surfaces including glass, tiles and paint.
Storage: The pens should always be stored in a cool, dark place with the cap clipped firmly on. These measures will ensure that the ink does not dry out and will increase the life-time of your pen.