Run a wash test on a printed piece from the real lot: at least 5–10 washes at the temperature given on the care label, drying as the end user would. Then check for peeling, cracking, fading and change of hand feel. A lab test can be requested according to ISO 6330 for washing procedures and ISO 105 series for colour fastness.
A simple workshop check: rub the print with a fingernail and stretch the fabric several times. If the film lifts or cracks, it should not go into production. Keep a control sample for comparison.
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