محاليل الإظهار ذات الطاقة القصوى .. كتاب التحميض والطبع والتكبير

Showing solutions with maximum energy
MAXIMUM ENERGY DEVELOPERS

These solutions are used specifically to take advantage of the maximum sensitivity of the film, and therefore are very useful in cases where you think that the film has not received sufficient exposure. Underexposed. In this case, types of solutions are usually used, such as those mentioned below:
(a) Showing solutions with pyro-almitol.
(B) Showing solutions with palmitol, hydroquinone and caustic alkalis.
(h) Showing solutions with hydroquinone and renal alkalis are similar in composition to some of the ultra-fast striping solutions.

First: Presentation solutions (Pyromitol) with maximum energy
The theory of using this type of solutions, to perform the previous purpose, depends on what pyro and mitols have of distinctive properties for them as shown.

Valmitol is able to show shadow details or underexposed areas. As for Albiru, it is characterized by what it causes in the image of staining and increases its density slightly in addition to the resulting density. Metallic silver (which in turn results from the reduction of silver salts).

This type of solution may not contain sodium sulfite salt at all or contain a small amount of it, because this solution is capable of reducing the degree of staining caused by pyro. Therefore, the lack of sulfite or its complete absence is compensated by adding a small amount of potassium metabisulfite Pot. Metabisulphite to be a preservative for the reducing agent (pyro) from rapid oxidation. The following is a statement of the composition of an appearance solution of this type.

Second - solutions of maximum energy exposure (palmitol - hydroquinone - and renal alkali)

MAXIMUM ENERGY (CAUSTIC-METOL-HYDROQUINONE) DEVELOPER

This type differs completely in its composition from the first type previously mentioned. These solutions contain a large concentrated amount of methol and hydroquinone. Adding a quantity of Wood Alcohol may help dissolve it in water. These solutions also carry another weight of sodium hydroxide (caustic soda) as an activating alkaline agent. Examples of that solution are the following (Appearance of Code No. 82).

Third: Very fast display solutions, characterized by their maximum capacity
Some of the ultra-fast elaboration solutions may also be included in the group of high-energy elicitors. An example of this solution is the following appearance, which is suitable in the following cases:

(a) As a rapid release of sensitive films and plates.
(b) As a manifestation in the event of a significant underexposure, as it is able to show clear details of the shadows or areas of little light.
(H) As a second appearance after bleaching the images in the processes of increasing the density of the negatives, the Intensification Process, and we will talk about it in another chapter.