Basic Blue 7, widely known as Victoria Blue R, is a classic triarylmethane dye that produces a brilliant, clean blue shade with a slight reddish undertone. It is valued for its high tinctorial strength and excellent solubility, making it a staple colorant in the ink and paper industries. While it has moderate fastness on textiles, its primary strength is its shade vibrancy and versatility in surface colouring applications.