One procedure for acid-base neutralization consists in pouring the piranha solution into a sufficiently large glass container filled with at least five times the solution's mass of ice (for cooling the exothermic reaction, and also for dilution purposes), then slowly adding until neutralized. If ice is not available then the piranha solution can be added very slowly to a saturated solution of sodium bicarbonate in a large glass container, with a large amount of undissolved bicarbonate at the bottom that is renewed if it is depleted. The bicarbonate method also releases a large amount of gaseous and therefore is not preferred since it can easily overflow with a lot of foam if the addition of the piranha solution is not slow enough, and without cooling the solution can also become very hot. See also Aqua regia () Fenton's reagent () Green death () Peroxydisulfuric acid, or Marshall's acid () Peroxymonosulfuric acid, or Caro's acid () RCA clean (silicon wafer cleaning procedure) Chromic acid () Superhydrophilicity Ultrahydrophobicity References External links (responsibly) (demonstrably) (demonstrably) Cleaning products Acids de:Piranha-Lösung