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Two different technologies have recently been developed to produce the exciting new effect shown by color travel pigments carrying the brand name Xirona®.
One form has been produced by coating synthetically produced silica flakes with metal oxides such as titanium dioxide or iron oxide. The silica flakes have their own interference color, which is determined by their thickness. For the creation of color effects, two variables can be used. First, the thickness of the silica flakes and secondly, the thickness of the metal oxide layers. Both can be precisely controlled and so by combinations of layers with varying thickness many different colors and effects can be achieved. The result is that the color of a Xirona® pigment will change depending on the angle from which it is viewed.
The other technology is multi layer on a mica substrate. If a SiO2 layer with low refractivity and a second highly reflective layer of TiO2 are correctly applied, these layers increase the reflection intensity of each platelet by approx. 90 %. In addition, appropriate layer thickness leads to interference systems with highly angle dependent colors; hence the color of the pigment will change depending on the viewing angle.
The Xirona® Color Travel pigments may be used in all cosmetic products, in combination with traditional pearl luster pigments as well as both organic and inorganic colors. They disperse well in both oil and water.
To achieve the best visible color travel use almost transparent, translucent and semi opaque base formulations together with transparent round , concave or vaulted packaging.
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