The Dess-Martin reagent contains this element attached to oxygen groups.
The Dess-Martin reagent contains this element attached to oxygen groups. This element forms the central atom of the acid used alongside the Schiff reagent in the PAS stain, and in another procedure this element is used as a mordant and followed up by a safranin counterstain. This element is also used to test for starch in solution, and deficiencies result in goiters. For 10 points, name this element, a heavy halogen whose solutions are usually purple, with atomic number 53 and symbol I.
The Dess-Martin reagent contains this element attached to oxygen groups.
iodine