Practice question · Multiple choice
Hypo-clearing agents accelerate chemical diffusion, whereas selenium toning alters the image silver. How does this functional distinction dictate their respective roles in archival longevity?
Hints
- What distinct chemical threat does each specific post-development treatment target?
- Which process aids the removal of processing bath residues rather than altering the image silver?
Show the answer
B. Clearing aids wash efficiency while toner protects against airborne oxidants
Why
Washing aids remove soluble processing salts faster, but cannot alter the metallic image itself. Toning chemically converts image silver to resist environmental oxidation, meaning neither step can compensate for omitting the other.
Practise Archival Processing and Permanence
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