The Trichloroacetic Acid, ACS, 30% 20ml Contains 20ml of acid diluted weight by volume (6g acid/14ml distilled water). We included a 2nd bottle with dropper for dilution if necessary. It can be diluted to 20% 15% or 12.5% for more sensitive skin. We only buy from our trusted supplier and repackage for resale. NOTE: Read all applicable information and instructions before use. This should only be used as directed, with proper protective equipment. Store securely away from children and untrained individuals