Complete the account of the developer and the sequence.
The component that suppresses development of unexposed grains and controls fog is the ______. The effect by which two agents together develop faster than the sum of their separate rates is called ______. The fixer dissolves undeveloped halides by forming soluble ______ complexes. The standard processing temperature is ______ degrees Celsius.
Word bank: restrainer · superadditivity · silver-thiosulfate · 20 · preservative · 24
Hints
- The first blank is the component that stops the developer attacking everything.
- The third blank names what the silver ends up dissolved as.
Show the answer
The component that suppresses development of unexposed grains and controls fog is the restrainer. The effect by which two agents together develop faster than the sum of their separate rates is called superadditivity. The fixer dissolves undeveloped halides by forming soluble silver-thiosulfate complexes. The standard processing temperature is 20 degrees Celsius.
The third blank is the chemistry that makes photography possible at all. Silver halides are insoluble in water, and thiosulfate works because it forms complexes with silver that are not, which is why exhausted fixer, already loaded with silver, stops working long before it looks any different.
Practise Developing the Negative
The app has 7 more questions on this lesson, and keeps your place in the course. Photography I is free to start.
More questions on Developing the Negative
- Arrange the stages of processing a black-and-white film in the order they are carried out.
- Metol and hydroquinone together develop faster than the sum of their separate rates.
- An alkaline environment activates the developing agent, yet an acid stop bath is introduced immediately…
- Why does a film developed with no agitation at all show streaks running down from the dense areas? Select…
- A film needs 10 minutes at 20 degrees Celsius. Using the multiplier table, how many minutes does it need at…
- An acid stop bath does nothing that a plain water rinse does not also do.