Wash fastness test.

A wash fastness test is a standardized laundering cycle, such as AATCC's TM61 accelerated laundering method or ISO 105-C06, the domestic and commercial laundering test written into European retail specs, run to judge how far a decorated garment changes after a controlled number of washes. Everything that matters is fixed by the method: water temperature, detergent, mechanical action, load and drying, which is what makes one lab's result comparable to another's. Grading is against gray scales for color change and for staining onto adjacent fabric, so it reports shade and appearance rather than whether the print stayed attached, and cracking or edge lift is a separate judgement. A shop usually meets this as a customer's spec sheet or a retailer's audit, where a failed report is not one reprint but a rejected delivery, followed by the argument over whether the blank or the decoration caused it.