Copying the original onto colour film.

The original coloured film can be copied onto Eastman Colour Internegative and the resulting colour negative printed onto a modern colour print stock. The results, provided the duplication sensitometry has been rigorously followed can be excellent as a record of the coloured image now. Some limited grading can "improve" some colours but these changes are very restricted and are largely to produce improved saturation. For example, a red tint can be made a little redder or more saturated by grading to a redder balance.

The other obvious disadvantages are cost of the colour stock, and the problems of storing colour negatives.

The duplication set up can be done using the LAD system provided that the Internegative material is used and processed in the standard Kodak specified manner, and this is dealt with in detail in the chapter on Duplication.

Some laboratories reduce the development time of the internegative by just a few percent in order to reduce the overall contrast and this can produce good results. If the process time is reduced by more than about 10% the three sensitive layers no longer develop to the same contrast and an unpleasant "cross contrast" effect occurs. Attempting to increase the development by more than about 10% produces similar cross-contrast effects. Commonly this results in prints with a different colour cast in the shadows to the highlights; red shadows, cyan-blue highlights in particular. Once a cross-contrast negative has been produced a good print is unobtainable, and only electronic digital techniques will correct the mismatched colour.

A further problem of departing from the standard process procedure is that the LAD system, which relies on a standardised characteristic curve to allow a fixed aim density to define the correct exposure conditions, may no longer apply, and the old two-point set up will be needed to cope with a non standard shaped curve. Rarely is all this effort worthwhile unless the laboratory is confident of spending the time [and the money].