تخيفض حجم الحبيبات في السلبيات مع تخفيض درجة تباينها ، محاليل الإظهار السريعة للغاية

Reducing the grain size of the negatives and reducing their contrast

The particle size can be reduced in large-grained negatives if we follow the following steps:

1- Remove all traces of hypo by washing in running water.

2- Treat the negative in the following solution to bleach it.

3- After the black color is gone from the image, we find the negative colored in blue, then it is washed with water until it becomes completely white.

4- The negative image is shown again in the next solution.
The negative is treated in the previous solution until its density and the degree of blackening return to the same as they were before exposure, but it is certain that the degree of density decreases when the fixation is made, and finally the degree of its contrast decreases and the size of its grains becomes smaller. And the previous steps can be repeated if the image remains highly contrasted, provided that it is well washed to get rid of the traces of hypo.

Ultra fast rendering solutions

Circumstances may sometimes call for films to be shown at an extreme speed, as in the case of press photography or X-Ray photography for medical purposes prior to performing urgent surgeries, or in filming the results of the last round in a horse race, or recording pictures of visits, handing over visitors or Newspaper men copies. Photographs of the visit before they left the place, etc. It has been shown that the concentrated or highly alkaline show solutions rarely complete the film show in a period ranging from half a minute to one minute only. Some show solutions with mitol and hydroquinone or show solutions with hydroquinone and caustic alkalis serve the same previous purpose. The speed of damage is confirmed therefore, and in the composition of very fast show solutions, potassium bromide may not be able alone to resist the fog, and therefore it is too much, but a solution of phenosafranine diluted with water at a ratio of 1000:1 is added to the show solution, and sometimes hydroquinone may suffice as a reducing agent in The solution, with the addition of a small amount of sodium sulphite, as we know - the speed of manifestation decreases if this quantity is increased, so the amount of this salt is usually transferred in this type of solutions. And since sodium sulfite preserves the reducing agent from precipitating, these solutions do not have a great ability to survive, rather they are rapidly perishable. Therefore, it must be used as soon as it is installed.

Once the display is finished, it should be stopped immediately by immersing the flag in an acid bath to stop the display, consisting of a dilute solution (10%) of acetic acid, and then the fixation begins in one of the quick fixing solutions that will be mentioned in the film fixing section.