Discussion
The measuring parameters for the determination of the age of ink based on extractability are :
(a) R-ratio
(b) Dye ratio
(c) Percent sublimation
(d) Percent extraction
Choose the correct answer from the options given below :
Answer: C
The parameters are (a), (b) and (d) only: R-ratio, dye ratio and percent extraction.
As ink ages on paper it dries and its resin hardens, so it becomes less soluble in a weak solvent. Extraction-based ink-dating methods measure this with three parameters:
- R-ratio: the amount of ink extracted by a weak solvent compared with a strong one;
- percent extraction: the fraction of ink extracted in a set time;
- dye ratio: the changing ratio of the ink's dye components.
Percent sublimation (c) is not an extractability parameter, so every option containing it is wrong.
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