Piranha solution
OXIDIZING ACID MIXTURE CONTAINING SULFURIC ACID AND HYDROGEN PEROXIDE
Piranha bath; Piranha etch; SPM clean; Base piranha; Piranha water
Piranha solution, also known as piranha etch, is a mixture of sulfuric acid () and hydrogen peroxide (), used to clean organic residues off substrates. Because the mixture is a strong oxidizing agent, it will decompose most organic matter, and it will also hydroxylate most surfaces (by adding –OH groups), making them highly hydrophilic (water-compatible).