Passage:
In the 1820s, artisans at the royal Gobelins tapestry manufactory in Paris repeatedly lodged complaints regarding the quality of incoming black dye shipments, claiming the pigments exhibited premature fading and noticeable chromatic instability. When chemist Michel Eugène Chevreul was appointed to investigate these alleged chemical deficiencies, he observed that isolated skeins of the black wool met rigorous standards of purity and colorfastness. However, when the exact same black yarn was woven in tight juxtaposition with deep red threads, observers perceived the black as distinctly greenish. Chevreul determined that the human retina, when stimulated by a given color, simultaneously projects an image of that color's complementary hue onto contiguous areas. The weavers' dissatisfaction, he concluded, arose not from flawed dye formulations, but from an unappreciated optical interaction that altered the perceived chromatic value of adjacent fibers.
In the context of the passage, the author's reference to black wool appearing greenish when woven beside red yarn serves primarily to
- Asubstantiate the weavers' initial contention that the chemical composition of the black dye was inherently defective
- provide an empirical example of how adjacent visual stimuli can distort the perceived color of a chemically stable pigmentAnswer
- Cdetail the exact physiological mechanism through which human retinal cells process complementary color pairs
- Dsuggest that artisans deliberately juxtaposed contrasting yarns to create novel aesthetic effects in tapestry weaving
- Eidentify a rare exception where standard colorfastness tests failed to measure the actual purity of textile wool