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Difficulty: MediumFlaw in the Reasoning

Art Conservator: A Renaissance oil painting will retain its original chromatic vibrancy for centuries if the painter applied a protective glaze containing dammar resin. Recent spectroscopic analysis of a sixteenth-century portrait revealed that its pigment layers have maintained exceptional chromatic vibrancy. Therefore, the artist who painted this portrait must have applied a dammar resin glaze.

The reasoning in the art conservator's argument is flawed because it

  1. A
    takes for granted that spectroscopic analysis is an infallible method for assessing pigment condition
  2. B
    generalizes about all Renaissance paintings based on an analysis of a single sixteenth-century portrait
  3. treats a condition that is sufficient to preserve chromatic vibrancy as though it were required to achieve that resultAnswer
  4. D
    confuses an intermediate finding used to support the argument with the overall conclusion drawn
  5. E
    relies on language that is too absolute when describing the chemical stability of historical resin glazes

Answer

The argument is flawed because it treats a condition sufficient for preserving chromatic vibrancy as though it were necessary.
The conservator establishes that applying a dammar resin glaze is sufficient to guarantee that a painting retains its chromatic vibrancy. When evidence confirms that the portrait has retained its vibrancy, the author concludes that the artist must have used dammar resin. This illicitly treats a sufficient condition as a necessary one, ignoring the possibility that other painting techniques or environmental factors could have preserved the colors.

Step-by-Step Solution

1
Analyze the conditional relationship in the first premise
The statement establishes that applying dammar resin glaze guarantees preserved vibrancy (Dammar Glaze → Retained Vibrancy).
Identifying the formal direction of the conditional rule is essential to evaluating deductive arguments.
2
Examine the evidence provided and the conclusion drawn
The evidence shows that vibrancy is retained, and the author concludes that the dammar glaze must have been applied (Retained Vibrancy → Dammar Glaze).
Comparing the direction of the premise with the direction of the conclusion reveals whether valid deduction took place.
3
Identify the logical flaw
The argument commits a mistaken reversal by treating a sufficient condition as if it were a necessary requirement.
There could be other methods or factors that also preserve vibrancy without using dammar resin.

Key Concept

Conditional Reasoning Flaw (Confusing Sufficient and Necessary Conditions)
Estimated Time:1m 15s
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Topics

Flaw in the Reasoning

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