1066. One of the great disadvantages in working the Lumiere method is that one cannot examine the plate during the first development, at least not with the ordinary light of the dark-room.

1067. Rodinal For Development

Rodinal For Development. The following method makes it possible to work in a deep, ruby light, if the plate is kept in the dark for the first two minutes, and then brought nearer to the light, so that the direct rays do not fall upon it, keeping it covered up as much as possible:

1069. A few drops of 10 per cent. potassium bromide may be necessary in developing landscapes or objects in which light colors predominate.

1070. Development should continue until only the deepest shadows show white on the surface of the plate. It cannot be inspected by looking through it. Wash for one minute, and reverse by immersion in Lumiere C Solution for four minutes as directed in the previous Table of Manipulations, afterward washing for one minute and then covering the plate with the following re-developer: .

1071. Now, take the dish into strong daylight and continue to develop until the image is sufficiently brilliant, afterward washing for two minutes and drying, no fixing being necessary.

1072. Two Amidol Developers

Two Amidol Developers. Another method offers still greater advantages, in that after the plate has been treated in the first developer in darkness for two minutes, it may be treated as an ordinary plate until fully developed. Amidol having the faculty for destroying all the color sensitiveness of the plate, the red light does not affect it materially. The following method will be found to work very successfully.

This is a very slow developer and its action can easily be watched.

1074. If it is desirable to shorten the time of development, or in the case of probable under-exposure, the following formula will be more suitable, and the plate may be treated with it after it has been partially developed in the above:

If dry sulphite is used, half the quantity will suffice.

1075. Development should be carried as far as possible without veiling over the deepest shadows. Reversal with the Lumiere C solution, subsequent washing, and re-development with D solution (as directed in the Table of Manipulation) and final washing for two minutes complete the picture. As an alternative, a 1 in 20 rodinal solution may be used for re-development, if desired. The above amidol developing formulae will be found to be invaluable, especially when developing plates which have received other than normal exposures.

1076. An Experiment - When the Autochrome plate has been developed in rodinal, fully reversed with C solution and washed, it may be immersed for one minute in a solution of commercial liquid sodium bisulphite, washed for one minute, and dried in bright daylight, when the undeveloped positive image will quickly assume a deep brown tint, and the picture is thus finished without further treatment. But, if necessary, local re-development may be attempted by means of a camel's-hair brush and a strong metol developer.