Chemistry Industrial Chemistry PMDC Conceptual Practice
PMDC Verified Question 16 of 41
What does the technological parameter 'dye fastness' denote regarding a colored textile material?
A
The kinetic diffusion coefficient of the dye during bath immersion
B
The stoichiometric solubility limit of the dye salt in boiling water
C
The total number of auxochromic groups per unit molecular weight
D
The resistance of dyed material to color change or fading under environmental exposure
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: The resistance of dyed material to color change or fading under environmental exposure
Concept:

Dye fastness measures the resistance of a dyed substrate to color degradation or bleeding when exposed to light, laundering, perspiration, and friction.

Formula / Reaction:

Qualitative concept / No formula required.

Solution:

  • Fastness is rated on standard grey scales from 1 (poor) to 5 or 8 (outstanding) for parameters such as wash-fastness, light-fastness, and rub-fastness (crocking).


Why other options are incorrect:

  • Option A: Describes dyeing kinetics (strike rate), not fastness.


  • Option B: Describes thermodynamic solubility in aqueous media.


  • Option C: Pertains to molecular chemical structure, not finished textile performance.

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