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Discussion

Match each source of variation with where it originates.
List I
A. Substrate variation
B. Dye strength variation
C. Water variation
D. Machine variation
List II
1. changes in hardness, iron or alkalinity
2. differences between lots of incoming fabric
3. differences in circulation between machines
4. differences between deliveries of the same dye

  • A.A-4, B-2, C-1, D-3
  • B.A-2, B-4, C-3, D-1
  • C.A-3, B-1, C-4, D-2
  • D.A-2, B-4, C-1, D-3

Answer: D

Each source must be controlled separately, and a dyehouse chasing shade problems without knowing which of the four is moving is working blind. Standardising each is what makes prediction possible. Four independent sources must all be held.

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