Figure 5
From: High-resolution 1D moirés as counterfeit security features
High-resolution moirés features. Optical images of the base layers: (a) rectilinear ‘ABC’ and ‘123’ moirés, resolution of 9754 dpi; (b) circular, radial ‘star’ moiré, 5080 dpi; and (c) circular, spiraling ‘EPFL’ moiré, 5080 dpi. Below are corresponding moiré images when base and appropriate revealing layers are super-imposed.
