The paper is impregnated with a solution of ammonium ferric citrate and dried. The best known is a process using ammonium ferric citrate and potassium ferricyanide. The blueprint process is based on a photosensitive ferric compound. It has almost entirely been replaced with digital computer-aided construction drawings. Practising engineers, architects, and drafters often call them "drawings", “prints”, or “plans”. The term blueprint continues to be used less formally to refer to any floor plan (and even less formally, any type of plan). It was first largely displaced by the diazo whiteprint process, and later by large-format xerographic photocopiers. The process was not able to reproduce color or shades of grey. The blueprint process was characterized by white lines on a blue background, a negative of the original. It was widely used for over a century for the reproduction of specification drawings used in construction and industry. Introduced by Sir John Herschel in 1842, the process allowed rapid and accurate production of an unlimited number of copies. A fretless fingerboard runs along the neck which is one of the most defining features of the Arabian oud.A blueprint is a reproduction of a technical drawing or engineering drawing using a contact print process on light-sensitive sheets. The neck extends the upper part of the instrument by 20 cm and is inserted into the sound box up to the sound hole. The peg box is placed perpendicular to the ouds’ neck. There are a series of pegs contained in a peg box for tuning. Its strings are attached to the bridge on the front of the oud and go over a nut at the top of the neck. The back of the Arabian oud is shaped like a bowl and made from many fine wooden strips. The Arabian Oud's face is flat and pear-shaped, containing from one to three sound holes. It has a rounded sound box attached to a small neck. The body of the Arabian oud is made from light weight wood. Ud can be poetically substituted with mizhar and the Arabian oud is also known as the barbat in Persian. However, recent research has suggested that ud may simply be an Arabic version of the Persian name rud meaning stringed instrument. It is believed to have been given this name (Arabian Oud) in Arabic in reference to the small pieces of wood used for the construction of the instruments delicate back. The name Arabian oud spelled ud in Arabic literally means twig and by suggestion piece of wood. The Arabian oud has been a part of the music of each of the ancient civilizations that have existed around the Mediterranean and the Middle East.Įven though the Arabian oud is an ancient instrument and is associated mainly with Middle Eastern music, a lot of modern western musicians choose to integrate Arabian oud into their music, and its not uncommon to hear an Arabian oud in contemporary rock and pop songs as well as in jazz music. There are pictures of the Arabian oud on ancient clay tablets and papyrus paper in museums throughout the world. From its morbid beginnings the instrument is depicted frequently during Mesopotamian history and in ancient Egypt. He is said to have suspended the body of his deceased son from a tree and that the very first Arabian oud was made from the shape of the skeleton. Persian legend tells that the Arabian oud was created by the sixth descendent of Adam: Lamech.
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