So I dumped my periodic acid like a moron...does anyone know of another reagent that will oxidize for the PAS reaction? Looks like I have acetic and hydrochloric acids...and that is all...hmm... Sarah Goebel-Dysart, BA, HT(ASCP) Histotechnologist Mirna Therapeutics 2150 Woodward Street Suite 100 Austin, Texas 78744 (512)901-0900 ext. 6912