Chlorosulfonic acid is just like the blood of a xenomorph when applied to an organic substance: it eats its way through it. Chlorosulfonic acid is a super acid, an acid that has an acidity greater than 100% pure sulfuric acid.
Chlorosulfuric acid (IUPAC name: sulfurochloridic acid) is the inorganic compound with the formula HSO3Cl. It is also known as chlorosulfonic acid, being the sulfonic acid of chlorine. It is a distillable, colorless liquid which is hygroscopic and a powerful lachrymator. [Source]