Module 3 — Wet processing and its footprint

Module quiz

5 questions on Module 3 — Wet processing and its footprint. Answer them all, then check your score before moving on. 4 correct or more is a pass. Your best score is saved on this device, and to your account when you are signed in. This is a self-check, not an accredited assessment.

1. 1. Lowering the liquor ratio in exhaust dyeing primarily reduces

   Colour fastness requirementsWater, and with it the energy needed to heat that water and the effluent volumeThe need for levelling agentsFibre damage during dyeing

2. 2. Why can a finish undermine recyclability even when the base fibre is single-fibre?

   Finishes always contain elastaneCoatings, laminates and cross-linked resins are hard to remove and contaminate the recovered streamFinished fabric cannot be shreddedRecyclers cannot detect finishes

3. 3. In denim laundry, the most reliable way to cut water per garment is to

   Increase machine load and combine or shorten wet steps, replacing some with mechanical or laser processesRaise the wash temperatureAdd more softenerUse a longer stone wash cycle

4. 4. What does a right-first-time dyeing rate tell you environmentally?

   Nothing — it is only a commercial measureEvery re-dye repeats the whole water, chemical and energy load, so RFT is a direct impact metricIt measures effluent toxicityIt only applies to reactive dyeing

5. 5. Which claim about effluent treatment is accurate?

   Treatment removes the need to reduce chemical use at sourceTreated effluent is always reusable in dyeing without further stepsTreatment manages what has already been used; source reduction and chemical selection still matter mostEffluent treatment has no energy cost