Abstract: A method of manufacturing a transparent body, such as a pane of a window, which has a predetermined opacity gradient. A light filtering substance is evaporated in an evacuated atmosphere upwardly from an evaporator to deposit itself upon a surface which is situated over and directed toward this evaporator, the latter surface forming part of a transparent body and the light filtering substance providing for the transparent body an opacity or optical density which increases as the thickness of the deposit of the light-filtering substance on the latter surface increases. The transparent body is maintained stationary in the evacuated atmosphere over the above evaporator during deposition of the evaporated substance onto the body surface which is directed toward the latter location.