Before revision: After initially supplying de Havilland only, ARL subsequently produced a refined form of Redux Liquid E/Formvar using a new liquid component known as Redux Liquid K6, and a finer-grade (smaller particle-size) PVF powder, and this was later made generally available to the wider aircraft industry as Redux Liquid 775/Powder 775, so-named because it was sold for aircraft use to specification DTD 775*.
After revision: After initially supplying de Havilland only, ARL subsequently produced a refined form of Redux Liquid E/Formvar using a new liquid component known as Redux Liquid K6, and a finer-grade (smaller particle-size) PVF powder, and this was later made generally available to the wider aircraft industry as Redux Liquid 775/Powder 775, so-named because it was sold for aircraft use to specification