True solution is a homogeneous mixture it shows the property of homogeneity and it's particle can not be seen with naked eyes it also doesn't scatter a beam of light (Tyndall effect). A colloidal solution is a heterogeneous solution it doesn't show the property of homogeneity. It's particle can't be seen with naked eyes, it shows Tyndall effect. A suspension is a heterogeneous solution it doesn't show the property of homogeneity. It's particle can be distinguished and it doesn't show the Tyndall effect.