Curtain Fabric Colorfastness: Lab Dips, Dye Lots & QC for Projects
Colorfastness and shade control are critical for project‑grade curtain fabrics. This guide shows how to plan lab dips, manage dye lots, and define QC standards to avoid shade bands and customer claims.
Color Approval Workflow
- Lab dip approval under agreed light source (day + night)
- Bulk shade approval from the exact production dye lot
- Pre‑shipment sample: random roll cutting with shade grading
QC Checklist
- Colorfastness ≥4 (AATCC/ISO) to washing/rubbing/light
- Repeat control for jacquards; width/GSM tolerance per roll
- 4‑point inspection standard; defect marking and claim policy
Dye‑Lot Management
- Single dye lot per color per shipment whenever possible
- Clear labeling on each roll; shade grading (A/B/C) aligned
- Maintain yarn supplier consistency and finishing recipe lock
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