Colour fast
Definition 1 of 1
Pro Tip 1/3Test Before Washing
Always check the label or test a hidden area to ensure clothes are colour fast before mixing with other laundry. 
She dabbed a wet cloth on an inside seam to test if her new jeans were colour fast.
Pro Tip 2/3Care Instructions
Read garment labels for care instructions as they often indicate if an item is colour fast or requires special treatment. 
The tag says it's colour fast, but to wash it in cold water only.
Pro Tip 3/3Quality Perception
Colour fast items are perceived as higher quality because they retain color better over time. 
These colour fast towels haven't faded at all, despite numerous washes.