Colour Fastness to Washing How to Read It on a Lab Report
Laboratory reports present Colour Fastness to Washing in a compact format. Knowing what each line means prevents misreading.
Definition reminder
resistance to colour change and staining. Working figures for Colour Fastness to Washing normally sit around grade 4-5 expected in mainstream production. Note ISO 105-C06 domestic laundering on the tech pack so nobody tests against an older revision.
Common report layout
The report states method ISO 105-C06 domestic laundering, sample description, conditioning, and the measured result. Record elastane content alongside Colour Fastness to Washing, because blends shift the measured value. A result outside grade 4-5 expected usually points to process drift rather than to the fibre itself.
Typical result
Values near grade 4-5 expected usually indicate a conforming lot, assuming the fabric matches the sample submitted. Keeping reference values for Colour Fastness to Washing lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 105-C06 domestic laundering, since both affect the reading.
Red flags
Missing revision numbers, unusual conditioning, and results without units all signal unreliable data. Working figures for Colour Fastness to Washing normally sit around grade 4-5 expected in mainstream production. Note ISO 105-C06 domestic laundering on the tech pack so nobody tests against an older revision.
Questions to ask
Ask the laboratory for the standard revision and sample description before accepting or rejecting a result. Record elastane content alongside Colour Fastness to Washing, because blends shift the measured value. A result outside grade 4-5 expected usually points to process drift rather than to the fibre itself.
