إنهاك الحامض المظهر .. كتاب أسس التصوير الضوئي

Sour exhaustion Appearance:

As a result of the increased use of the acid that appears, we find that its effect gradually weakens in the process of showing, which necessitates changing it, adding something that renews its activity, or prolonging the time required for showing.

Experiments have shown that it is sufficient to show eight films measuring 6 x 9 cm or 24 x 36 cm millimeters in a liter of acid developer. It is noted that it is more appropriate to lengthen the time needed for showing by 10% in each film than the previous one due to the gradual consumption of the strength of the highlighting solution.

Notes for the composition of the display solution:

(1) It must be verified that each salt has completely dissolved before starting to dissolve the next salt.

(2) The salts must be dissolved in the order shown in the tables.

(3) It is always good when dissolving salts to start with a quantity of water less than the required amount
(750 cm 2 for example) and then complete the final solution to 1000 cm.

(4) In order to facilitate the dissolution process, this can be done in water at a temperature of 400 degrees Celsius. It is not permissible to exceed that for fear that some salts will oxidize or change their properties, provided that the volume of the required solution is supplemented with cold water.