Solution of hydrogen fluoride (HF) in water
Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water. Solutions of HF are colourless, acidic and highly corrosive . It is used to make most fluorine-containing compounds; examples include the commonly used pharmaceutical antidepressant medication fluoxetine (Prozac) and the material PTFE (Teflon).
Appearance: Colorless liquid
Chemical formula: HF (aq)
Density: 1.15 g/mL (for 48% soln.)
EC Number: 231-634-8
Used for etching Alloy Wheels removal of brake dust etc etc
But........... wear gloves as it dont stop burning through skin and even bone when used neat!!!
Hydrofluoric acid (HF) is a liquid (or gas) which is the most corrosive acid known when in concentrated form. Concentrated HF (70%) will fume on contact with air and eat away Skin and Bone