Originally called "mistake out", the liquid paper is an invention of Bette Nesmith Graham, who was a Dallas secretary and a single mother raising a son on her own. Using her own electric kitchen blender, she mixed her very first batch of liquid paper or whiteout, a substance used to cover up mistakes made on paper. Colored to match the stationery she used, she put some tempera water based paint in a bottle and took her watercolor brush to the office. She used this to correct her writing mistakes…and her boss never noticed. Soon, another secretary saw the new invention and asked for some of the correcting fluid. At home, Graham found a green bottle, wrote "Mistake Out" on a label, and gave it to her friend. Soon all the secretaries in the building were asking for some, too. She was selling about 100 bottles per month. In 1967, she opened a factory and a head office. She changed the name from "Mistake Out" to Liquid Paper. Her factory was eventually bought by Gillette Corporation for $47.5 million in 1979. Again, liquid paper was bought by Newell Rubbermaid in association to Gillette's Stationery Products group in the year 2000. Currently, it's sold by PaperMate. Her invention ended up being one of the most used and common office products in the 20th century, and liquid paper have still been creating and selling products that are in need for anyone around the world.