Macroscopic photographs of CNC films prepared from a suspension of (a-c) higher salt concentration or (d-f) lower salt concentration, and in absence of magnetic field (a,d), in a vertical field (b,e) and in a field locally exploring different tilts (c,f). Each film was observed in specular (left half) and off-specular (right half) conditions. Pictures (a-e) are adapted with authorization under the terms of the CC-BY 4.0 license.[23].