Sort by more than darkness
A black wool jumper, a navy cotton shirt and dark stretch jeans may look like one load but have different washing requirements. Read their labels and group items that can share the same treatment. Check whether a new garment needs washing separately before it joins established favourites.
Turn suitable garments inside out and close fastenings as directed. For denim, Levi's recommends inside-out washing. Avoid packing rough hardware against delicate cloth where possible; the colour is not the only thing you are trying to preserve.
Use the permitted wash
Choose a programme and temperature allowed by the label and a measured amount of appropriate detergent. More detergent is not automatically more effective. Check marks before washing rather than repeatedly treating the entire garment to solve one overlooked patch.
Do not rely on a vinegar rinse to fix every dye. Different fabrics and finishes behave differently, and a household recipe can distract from the instructions supplied with the item. If colour transfer is a concern, follow the maker's advice rather than testing the risk alongside lighter clothing.
Think about drying and storage
Follow the drying label. Levi's advises keeping dark denim out of direct sunlight to limit fading; similarly, avoid leaving valued dark clothes exposed unnecessarily on a bright windowsill. Check thick seams and waistbands are dry before storage.
Some gradual change may still occur through ordinary wear. Look at whether the garment remains useful and whether fading is even or concentrated in one area. A bag strap or repeatedly folded edge can create local wear that a different detergent will not solve. Adjust the source of friction where practical, rather than expecting washing alone to preserve a permanently new appearance.
