Piranha solutions are a mixture of concentrated sulfuric acid with hydrogen peroxide, usually in a ratio of 3:1 to 7:1. They are used to remove trace amounts of organic residues, such as photoresist, from substrates. read more
Piranha solution, also known as piranha etch, is a mixture of sulfuric acid (H 2 SO 4) and hydrogen peroxide (H 2 O 2), used to clean organic residues off substrates. read more
Typically, there are two different piranha solutions used in the laboratory. Acid piranha is a 3:1 mixture of concentrated sulfuric acid (H 2 SO 4) with hydrogen peroxide (H 2 O 2). It produces heat upon mixing and is self-starting, meaning it will react with organics without being heated. read more