Check the listing for details. True Colloidal Silver - 100 ppm - 250 mL (8.45 Fl Oz) in Clear Plastic Bottle. Condition: New. Listed at 39.90 USD. You are purchasing 250 mL of Sirius Metals true colloidal Silver -100 ppm - in a clear plastic bottle. The average nanoparticle size is 2 Silver atoms with about 0.6 nano-meters in size. There is no true colloidal Silver product with smaller Silver nano-particles as we have inspected them all. No (0.00%) chemicals are found in this product - only 99.99+% pure Silver nanoparticles colloidally suspended in pure pharmaceutical grade water. No other ingredients - especially no preservatives or stabilizers as found in other colloidal Silver products. The shelf life of this true colloidal Silver can be several years unopened. PLEASE DO NOT ALLOW THIS PRODUCT TO FREEZE as all of the Silver nano-particles will no longer be colloidally suspended and afterwards, colloidal suspension may collapse resulting in a loss of color as the Silver nano-particles will have fallen to the bottom of the bottle, leaving only clear water.