Other dyes.

The effect of fading tripack dyes is rather different from the fading of metallic toning dyes of early toned films, and 2-colour duplitized films, that sometimes became denser or less saturated or alter hue with time, often in a patchy, uneven way as fading may be dependant on ultraviolet light from projection. No percentage fading measurements are really useful in these instances. It is often necessary to make an internegative or a separation to work with that does not have a record of the patchy or uneven nature of the dye. In some cases, this is not possible, but some films can be recorded onto black and white for subsequent Desmetcolor or recreating tinting and toning by using a filter to eliminate or reduce the unevenness in the duplicate image. The filter should be selected by trial and error but it should be of the same or similar colour to the dye colour, and the film recorded on panchromatic film stock.