Solução de H2SO4/H2O2, 4:1 . Utilizada para limpar resíduos orgânicos de substratos.
Meaning
Piranha cleaning solution, also known as piranha etch, is a warm mixture of sulphuric acid (H2SO4) and hydrogen peroxide (H2O2), used to clean organic residue off of substrates. Because the mixture is a strong oxidizer, it will remove most organic matter, and it will also hydroxylate most surfaces (add OH groups), making them extremely hydrophilic (water compatible). (http://www.az-encyclope...)