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Photosensitive varnish

Varnish that changes color with the light
They are unique and experimental products that Cromas has decided to commercilize because of the big demand. The first photosensitive pigments have been used industrially in the lenses for sunglasses in order to reduce the intensity of light with the sun.
In the sector of the varnishes these are used for decorations of great effect but especially temporary, since the pigments have not high resistance to direct sunlight, where you get the greater change. A change can be forced for interior with wood light or other UV source.
Moving from internal to external the color change of the photosensitive varnish is total over 1-3 seconds, depending on how much light is present and fully reversible within 5-15 seconds.
Of great effect for exhibits, exhibition stands, furniture and objects where for example appear writings or logos first invisible in light and then magically in the foreground.
The colors if seen indoors under neon light appear essentially colorless, with a strong change that may be affected by a colored background or not, the biggest change is achieved, however, with a white background.
The colors available are:

Colorless → Rosso
Colorless → Blu
Colorless → Giallo
For information on the colors available in stock we suggest to contact us

For uses in the textile and leather industry we can also provide pigment concentrate pastes based solvent or pigment with disperdent in solid phase to be used for applications in water-based by spray or roller.
The products are suitable for indoor use only, outdoor they show a short duration in time and also can not be protected with anti-UV transparent because they lose the ability to change the color.
In order to permit evaluation of the effect and for small surfaces a test kit of the product is available, for information please do not hesitate to contact us.
The effect can be layed by the use of a primer on:
- wood
- metal (iron, aluminium, brass etc ...)
- plastics (ABS, ABS-PC, etc ...)
- glass
- version applicable for interior walls

For more information on the phenomenon of photochromism should visit the following links:
Photochromism
pac.iupac.org
Spiropyran