Polaroid is a brand used to identify a series of Polaroid Corporation products, famous above all for the instant camera with self-developing films.
Polaroid Corporation has created a wide range of instant cameras with self-developing films, which do not all use the same type of sensitive cards. Most use SX-70 or 600 films. Polaroid has stopped producing any type of analogue film, although it has developed with Fuji, modeled on the instax mini8 of the Japanese house, an instantaneous analog camera and its related films ( compatible with the Fuji Instax mini8 format), called Polaroid 300.
"In February 2008, Polaroid Corporation announced the cessation of instant film production, and in March 2008 announced the relaunch of new Polaroids by the end of the year, thanks to ZINK (" Zero-Ink "), a new ink-free printing technology.The camera contains a very small color printer that works on a particular photographic paper made of crystalline pigments that are colored thanks to a thermal process ". (Wikipedia)
In 1929 Polaroid Corporation registered the patent (Patent 1918848) of a special plastic sheet used to polarize light.
The initial support, developed later in 1932 by Edwin H. Land, consists of a series of microscopic crystals of iodiochinine sulfate or herapatite immersed in a transparent polymeric film of nitrocellulose.
Also known as J-Sheet, (in Italian Sheet-J), it is replaced and improved by the H-Sheet Polaroid, invented by Land in 1938. The H-sheet is a polymer composed of iodine-impregnated polyvinyl alcohol.
Another type of Polaroid is the K-sheet polarizer; consists of aligned chains of polyvinyl. This polarizing material is particularly resistant to moisture and heat.
All Polaroid sheets (sheets) are used in liquid crystal displays, optical microscopes and sunglasses. A historical collection of sunglasses is found at the Safilo Private Collection and, in smaller numbers, at MIT in Boston and MOMA in New York.