Lithol Rubine BK is a bright and intense red dye that is commonly used in various applications such as inks, textiles, plastics, and coatings. However, it is important to note that there are various synonyms for this popular pigment including Pigment Red 57:1, C.I. 15850:1, Red Lake C, and C.I. Pigment Red 81. These synonyms are used interchangeably depending on the industry or application. Some manufacturers and suppliers may even use their own internal product codes for this dye. Regardless of the name, Lithol Rubine BK is a versatile and widely used colorant that adds a vibrant red hue to various products.