The Pen
Ink 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 when drawn onto any other surface. The video below shows a side-by-side comparison of the ink on a normal piece of glass when compared to a commercial photocatalytic glass.
*UV source can be sunlight or BL / BLB light bulbs.
Video shows typical behaviour when exposed to 2 x 4W BLB bulbs.
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 back on. These measures will ensure that the ink does not dry out and will increase the life-time of your pen.
Ink Intelligent currently offer two different pen models; RZ and MB indicator pens. The RZ pen changes from blue to pink when irradiated on a photocatalytic surface, while the MB pen changes from blue to colourless*
*footnote: Blue colour will return very slowly if the ink is left on the glass so ensure to clean thoroughly after use