محاليل إظهار الصور السالبة وخصائصها .. كتاب التحميض والطبع والتكبير

Chapter four

Solutions showing negatives and their properties

These solutions are divided into the following categories:

1 - Showing solutions that lead to medium contrast
Normal Contrast developers
2- Exposure solutions that lead to high contrast
High contrast developers

3- Exposure solutions that lead to low contrast
Low Contrast developers (Soft).
4- Exposure solutions that lead to fine particles
Fine Grain developers

This last type is divided into other sections depending on the accuracy of the granules (an explanation of this will come in this section).

5- Highlighting solutions may be included under any of the four previous sections, but they are distinguished - in addition to the above - with certain characteristics to perform their functions in special circumstances, and we give the following examples:

(a) Presentation solutions at elevated temperatures
Tropical developers
(b) Low-temperature show solutions
Low Temperature developers
(h) Rapid reveal solutions
High Speed ​​developers
(k) Showing solutions with maximum energy
Maximum Energy developers
(e) Highly concentrated showcasing solutions.
Concentrated developers

It is customary for the display solution to be given a name that indicates the reducing agents or other salts it contains, for example:

- Mazhar solution (mitol - hydroquinone)
Appearance Solution (Peru - Soda)
Appearance Solution (Parmino Phenol Hydrochloride)
Appearance solution (glycine)

Often, an indication of its source is added to the name of the presenting solution (1) or initial letters indicating the research organization that published the composition of this solution, and numbers that distinguish each presenting solution from others, or an indication of its most important properties. ) - Kodak No. 1 1- Increase contrast.

Or Gephardt's (Glycine) film developer solution No. 204 leads to fine granules. etc.