A common way to check the quality of colloidal silver is the Tyndall test. This involves shining a laser pointer through the solution. If the solution is a traditional ionic solution, it will have no line or a barely visible line in subdued lighting. If the solution is an amber colloidal solution, it should have a faint line visible through the solution. You should never see ‘sparkly’ flakes as these indicate poorly made solution with overly large particles. Nano particles below a certain size are too small to be visible with this method but all colloidal solutions have particles in a range of sizes so will show some effect. A very intense tyndall effect is a sign of large particle sizes. The ideal would be a faint line with no visible texture and no ‘sparklies’.