This is a 2% w/v solution of ferric chloride hexahydrate used in the Verhoeff elastin stain (catalog # 8885A). Other reagents required for Verhoeff’s stain are: 5% w/v alcoholic hematoxylin (catalog # 6210A), 10% w/v ferric chloride hexahydrate (5660A), Lugol’s Iodine (catalog # 652A), Van Gieson stain (8880A) and 5% w/v sodium thiosulfate. It is Manufactured in the United States by Medical Chemical Corp.