Indanthrene yellow paper • Quick and easy determination of hydrosulfite • The test paper allows the easy determination of Hydrosulfite (sodium dithionite). • It is used to determine the endpoint in the conversion of vat dyes to the leuco form. • Because of the special purpose, indanthrene yellow paper is also called Hydrosulphite paper. Product data • Presentation: Pack of 200 strips 20x70 mm • Color reaction: yellow ↔ blue • Minimum purchase: 5 packs