Color Shifting Film (CSF)

New optically variable pigments are designed for anti-counterfeiting and product-authentication. Because color-shifting effects are obvious to the unaided eye they are desirable for decorative and security applications. The benefit in security applications is twofold: the obvious color shift helps to detect and deter counterfeiting. That the color-shifting effects can only be reproduced through a highly sophisticated combination of technical and manufacturing wizardry offers an additional advantage for security.

Just turn the label around, we can easily identify the labels which is CLEAR (NO COLOR) and then change to LIGHT BLUE COLOR.