colloidal silver..lol
http://www.britannica.com/EBchecked/topic/125898/colloid
http://www.mayoclinic.com/health/colloidal-silver/AN01682
It doesn’t sound like colloidal silver to me. Siver ions are completely dissolved like the sodium ions in table salt in water. Colloids are suspensions; colloidal silver sounds like a suspension of elemental silver, not a silver salt. Silver salts have been used on wounds in medicine for a while, typically burns.