These are thyroperoxidase (TPO), thyroglobulin (Tg) and the TSH receptor. Other autoantigens, such as the Sodium Iodide Symporter (NIS) have also been described, but as yet have no diagnostic role ...

Hydrogen peroxide breaks down slowly into water and oxygen. Adding a catalyst such as sodium iodide or potassium iodide makes this happen much more quickly, as shown in the video below.