It is a reactive solvent that has the ability to transform into harmless products, those precisely, water and oxygen. In various recipes, the bleach of the shellac is advised, which is washed with hydrogen peroxide and then dissolved in pure alcohol. Giovanni Secco Suardo (1894) indicates its use in restoration as a bleach, in particular in order to make the blackened lead white, white again. Hydrogen peroxide is sold in different concentrations expressed in volumes that indicate the quantity of gaseous oxygen developed from a volume in solution.