A colloid is a particle that is so small it can fit inside a human cell. Colloidal silver refers to the electrical suspension of colloids of pure silver in water, basically making colloidal silver a mineral water.
There are two main types of colloidal silver, ionic silver and nanoparticle silver. Ionic silver is only pure silver and pure water. It should always be colorless and have a slight metallic taste. This is the type of silver most often sold commercially, and it is most widely used. Nanoparticle silver is always yellow/amber in color. As the concentration gets higher, the darker the color. For example, 20ppm should be yellow and 4000ppm should be deep brown. The other ingredients are added as reducing agents and capping agents. The reduction agents assist in combining the silver ions into nanoparticles, and the capping agents help protect those nanoparticles to resist stomach acid. Nanoparticle (vs ionic) has a few more ingredients and uses much “fancier” equipment to ensure proper brewing and purity.
Nanoparticle “TRUE” Colloidal Silver (the kind Silver Seas brews) is better for oral use as it resists stomach acid and goes directly into the bloodstream.