Wendy Vecchi has two types of ink in her Make Art line: Archival and Blendables. The color is the same, they are from Wendy's palette however; one ink is an Archival ink (permanent/non reactive) and the other is a dye based (blendable/reactive with water). You can stamp with either ink but Archival will not blend with water. Wendy does have videos where she uses isopropyl alcohol to blend out Archival inks to make backgrounds.
By: Ranger Ink