Photochromic Granule is ultra violet sensitive, so when they are placed in sunlight or near an ultra violet lamp it changes from clear to one of a selection of colours.
Therefore, when removed from the UV source it changes back to the original colour.
Standard colours from stock: Colourless to Purple Pale Green to Blue Colourless to Red In addition, other colours can be made to order, such as Yellow, Orange, Green and Turquoise.
This material is primarily suitable for use in injection moulding or extrusion, however, can be used for dosing into many polymers such as PP PE HDPE TPE TPU PU EVA PVC.
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