Check the listing for details. True Colloidal Platinum NanoParticles (PtNPs): 10 ppm - 500 mL in Plastic. Condition: New. Listed at 29.00 USD. True Colloidal Platinum (10 ppm) - 99.99+% purity - 500 mL (16.9 Fl Oz) in a clear BPA-free Plastic bottle Non-toxic CAS # 7440-06-4 Volume: 500 mL, 16.9 Fl Oz 10 ppm 10 mg/L 99.99+% purity (metals assay) Color: Gray Ingredients: Pharmaceutical-grade pure water, 99.99+% pure Platinum nanoparticles pH: Acidic Flammability: Non-flammable Odor: None Reactivity: None Container: Clear BPA-free plastic bottle with black phenolic cap Shelf life: 2+ years Made in the USA Protect from freezing The shelf life of this true colloidal Platinum can be several years unopened. The average nanoparticle size is 2 Platinum atoms with about 0.28 nanometers in size. There is no true colloidal Platinum product with smaller Platinum nanoparticles as we have inspected them all. No (0.00%) chemicals are found in this product - only 99.99+% pure Platinum nanoparticles colloidally suspended in pure pharmaceutical-grade water. No other ingredients - especially no preservatives or stabilizers as found in other colloidal Platinum products. PLEASE DO NOT ALLOW THIS PRODUCT TO FREEZE! If allowed to freeze, all of the Platinum nanoparticles will no longer be colloidally suspended and afterward the colloidal suspension may collapse resulting in a loss of color as the Platinum nanoparticles will have fallen to the bottom of the bottle, leaving only clear water. WARNING: Avoid contact with this product if allergic to Platinum; allergic reactions to Platinum are extremely rare.