Pink String and Sealing Wax is a 1945 British drama film directed by Robert Hamer and starring Mervyn Johns. It is based on a play with the same name by Roland Pertwee. It was the first feature film Robert Hamer directed on his own.The title derives from the practice of pharmacists in the Victorian and Edwardian age of wrapping drugs in a package sealed with pink string and sealing wax to show the package had not been tampered with.