Packaging and storage—
Preserve it protected from light, in inert, collapsible capsules or in other suitable single-dose containers.
Clarity and color of solution—
It is clear and colorless.
Identification—
It responds to the tests for
Silver 
191
and for
Nitrate 191.
Assay—
Place 5 mL of Ophthalmic Solution, accurately measured, in a conical flask, dilute with 20 mL of water, add 1 mL of nitric acid and 1 mL of
ferric ammonium sulfate TS, and titrate with 0.02 N ammonium thiocyanate VS. Each mL of 0.02 N ammonium thiocyanate is equivalent to 3.397 mg of AgNO
3.
