Here's why:

* True solutions are homogeneous mixtures where the solute particles are completely dissolved in the solvent. These particles are incredibly small (usually at the atomic or molecular level) and evenly distributed throughout the solution.

* Scattering of light (Tyndall effect) occurs when light encounters particles larger than the wavelength of light. Since true solutions have particles too small to interact with visible light, they do not scatter light.

Examples of true solutions:

* Sugar dissolved in water

* Salt dissolved in water

* Alcohol dissolved in water

Let me know if you'd like more examples or want to know about mixtures that *do* scatter light!