Tipp-Ex errors" (German: "Tippfehler"). He subsequently founded a company of the same name. Shortly after that a "Tipp-Ex Sales & Distribution" company (Tipp-Ex Vertrieb GmbH & Co. KG) was founded in Frankfurt by Otto Carls. This company still exists under the name of Tipp-Ex GmbH & Co. KG close to Frankfurt. "Tipp-Ex" became a registered trademark with the German patent office in 1987. Earlier, in 1951, Bette Nesmith Graham invented the first correction fluid in her kitchen and began marketing the product in 1956 as "Mistake Out", later called Liquid Paper. Tipp-Ex GmbH only started to produce white correction fluid in
Bette Nesmith Graham bank. She realized, as she said, "with lettering, an artist never corrects by erasing, but always paints over the error. So I decided to use what artists use. I put some tempera water-based paint in a bottle and took my watercolor brush to the office. I used that to correct my mistakes." Graham secretly used her white correction paint for five years, making some improvements with help from her son's chemistry teacher at Thomas Jefferson High School in Dallas. Some bosses admonished her against using it, but coworkers frequently sought her "paint out". She eventually began marketing her typewriter correction