Figure 2
From: Structurally Coloured Secondary Particles Composed of Black and White Colloidal Particles

Photographs of the glossy secondary particles with and without CB.
(a) Secondary particles composed of silica particles 360 nm in diameter and CB (left). Secondary particles composed of silica particles 360 nm in diameter (right). (b) A secondary particle composed of silica particles 360 nm in diameter and CB (left). A secondary particle composed of silica particles 360 nm in diameter (right).