Bio-Ink flow is a green, highly viscous, easy to apply paste for marking sore spots on the gum and locating them on the denture. Bio-Ink flow is intended for marking points, areas, and lines on the oral mucosa, such as sore spots, AH-line, and mucosal bands. The relevant areas are colored with Bio-Ink®-Flow on the previously dried mucosa. When the dried denture is inserted, the color which has been applied to the sore spot is being transferred. Subsequently, the removable restoration can be adjusted.