Bottle dyed perspex.

Model bottle in dyed perspex, used as an aid to bottle design, particularly to show the appearance of the filled bottle, 1960 onwards

Model bottle in dyed perspex (acrylic) , used as an aid to bottle design, particularly to show the appearance of the filled bottle, 1960 onwards. Perspex is a trade name for transparent acrylic, registered by ICI on 16th November 1934. It is derived from the latin verb perspicere - to see through. Perspex was sold commercially by 1936.