Bath bombs' primary ingredients are a weak acid and a bicarbonate base.[7] These are unreactive when dry, but react vigorously when dissolved in water to produce their characteristic fizzing over a period of several minutes. Wadi o Uadi - Val o río seco que se encuentran generalmente en zonas desérticas, http://ventadeaccesoriosdeducha.com.mx/estropajo-de-ixtle/198-estropajo-de-ixtle-facial.html