Apply PDCA to investigate a textile dye shade drift before changing the recipe at scale.
The reframe: shade correction is not a recipe debate; it is a learning loop. Plan the question Write the gap in measurable terms: target shade, measured Delta E, lot, machine, substrate, and customer tolerance. Then state one suspected cause. A plan like "make it darker" is not a plan; "verify whether final bath pH at 6.8 caused lower fixation" is a plan. Do the smallest credible test Use a beaker, a one-roll reprocess, or the next lot only if the risk is contained. Change one variable where possible. If you alter pH, temperature ramp, and salt together, you may get…
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