Colloidal gold

Colloidal gold consists of tiny gold particles suspended evenly in a liquid, usually water. These particles are so small that they don't settle out or separate over time, creating a stable suspension. Colloidal gold is used in various applications, including medical diagnostics, where it can help detect diseases, and in electronics and art for its unique color and properties. Its distinctive reddish or purple hue results from the way it interacts with light, which is also the basis for its use in some cosmetic and therapeutic products.