You can see them even at that scale. The original experiments by Tyndall that demonstrated the effect were in a tube [1] currently on display at the Royal Insti

You can see them even at that scale. The original experiments by Tyndall that demonstrated the effect were in a tube [1] currently on display at the Royal Institution. [1] https://www.rigb.org/sites/default/files/styles/original/public/galleries/lblock_test_trh_1_2f03201e0257167.jpg https://www.rigb.org/sites/default/files/styles/original/pub...