Colour depends on how you look
Colour appearance depends on the textile, the light and the observer. A fabric can look different in daylight and under indoor lighting. Comparing references under agreed lighting conditions makes communication more reliable than judging a phone photograph alone.
From shade to performance
The colour target must be considered together with dye suitability and colourfastness. Fixation and the removal of unfixed dye are important parts of a dyeing process. A pleasing initial shade does not, by itself, demonstrate how the fabric will perform after washing or use.
Approve a shared reference
When requesting a dyed fabric, provide a physical colour standard where possible. Agree how a trial shade will be reviewed, retain the approved sample and discuss acceptable variation before ordering. Specify the intended care conditions and ask for the relevant evidence rather than relying on a screen colour.