Typical agents are ammonium nitrate and ammonium sulfate. Potassium nitrate can be made by combining ammonium nitrate and potassium hydroxide. Boiling vegetables lowers nitrate but not nitrite. Silver chloride is easily synthesized by combining aqueous solutions of silver nitrate and sodium chloride. Ozone is also added to recirculating systems to reduce nitrite levels through conversion into nitrate. Bird guano has high levels of nutrients like nitrate and ammonium. Silver thiocyanate is produced by the reaction between silver nitrate and potassium thiocyanate. The most extended mixture contains sodium nitrate, potassium nitrate and calcium nitrate. The bomb consisted of about of ammonium nitrate and nitromethane. The BLU-82 uses ammonium nitrate and aluminium (cf. Ammonium nitrate (NHNO) is also widely used. The toadlets were kept in dilute solutions of ammonium nitrate of various strengths. Strong acids dissolve gallium, forming gallium(III) salts such as (gallium sulfate) and (gallium nitrate). Numerous safety guidelines are available for storing and handling ammonium nitrate. It was filled with close to of ANFO (i.e., ammonium nitrate and fuel oil).