And paint is composed of solid particles found in the liquid state. Now, carbon systems also experience something called a Tyndall effect. The tyle effect is a scattering of light due to the presence of large particles. Now, if you look at this system here, pretend that this is a cup and inside is a colloidal system, okay? And these are the colloidal particles or the large particles. Now, when light will enter it's going to bounce back and forth between these particles and it's going to lose energy.