The short answer
- Black denim is often dyed with sulfur dyes, which wash well but rub off with friction: knees, thighs and hems go grey first.
- Wash less, inside out, cold, with other darks and a detergent for darks.
- Never dry black jeans in the sun or on high heat.
- If you'd rather not fuss, a gray wash fades gracefully and hides wear.
Blue jeans fade and everyone calls it character. Black jeans fade and they just look old. Part of the reason is contrast: a black yarn wearing down to grey shows every scuff, where indigo shades softly from blue to paler blue. The other part is the dye.
Why black denim fades
Much black denim is colored with sulfur dyes, the workhorse dye class for cotton. They're inexpensive and resist washing out, but they're known to have poor fastness to rubbing (sulfur dye overview). That's why black jeans fade in a pattern: the thighs, knees, seat and hem edges, where fabric rubs against skin, chairs and itself, go grey first. Washing matters too, because every cycle is an hour of fabric rubbing against fabric.
Some black denim is dyed over an indigo base, which fades from black through blue-black toward blue. Either way, the same habits slow it down.
The black-jeans routine
| Step | Do | Why |
|---|---|---|
| Before | Wash only when needed; spot clean and air in between | Every wash costs color |
| Prepare | Turn inside out, close the zip or buttons, empty the pockets | Moves the rubbing to the inside face |
| Sort | Wash with other blacks and darks, not with towels or jeans with hardware that rubs | Less friction, no lint showing on black |
| Wash | Cold, gentle or delicates cycle, a detergent for darks, no bleach or brighteners | Cold releases less dye |
| Spin | A lower spin speed if your machine allows it | Fewer hard creases that wear into grey lines |
| Dry | Hang inside out, indoors or in the shade | Sun and heat both fade black |
Consumer Reports' advice on black clothes lands in the same place: cold water, wash only when necessary, and take care with drying. The general routine for every wash is in how to wash jeans without fading.
Fit matters more than you think
Black jeans that are too tight fade faster at the thighs and knees, because tight fabric rubs and strains with every step. If your black pairs always go grey across the front of the thighs first, that's a sign of tension, not just washing. A fit with a little more room in the thigh, or a fabric with more stretch, spreads the wear. Why jeans wear out between the thighs goes into this in detail.
When the black is already gone
- Re-dye at home. A black fabric dye for cotton can restore color. Results vary: the topstitching thread (often polyester) won't take the dye, and the color won't match a new pair exactly.
- Wear the grey. Faded black looks good on its own terms, especially in a straight or relaxed fit with boots.
- Choose grey next time. Our Grey wash starts where black ends up, so the fading is less obvious.
Hand washing black jeans
If your machine has no gentle cycle, a hand wash is kinder still. Fill a tub with cold water and a small amount of detergent for darks, turn the jeans inside out and push them under. Soak for 20 to 30 minutes, swish rather than scrub, then rinse in clean cold water. Press the water out (don't wring and twist), roll them in an old dark towel, and hang them inside out to dry. Expect the water to turn grey the first few times; that's loose dye, not damage.
Every Jeanszilla style comes in Black, Grey and six other washes; denim washes explained compares how each one ages.
One timing note for a new made-to-measure pair: try it on before the first wash. The Fit Guarantee covers the first pair in each fit when you tell us within 30 days of delivery and the jeans are unworn and unwashed.
Or see women's skinny jeans and all women's styles.
Questions
Why do black jeans turn grey?
The black dye rubs off the surface of the yarn with friction and washing, revealing the paler cotton underneath. The areas that rub most fade first.
Does vinegar keep black jeans from fading?
There is little evidence that vinegar fixes factory dye. Washing less, cold water, inside out and air drying do far more.
Can I tumble dry black jeans?
It's best not to. Heat and tumbling both speed up fading. Hang them inside out, out of direct sun.
Do black jeans bleed dye?
New black denim can transfer some dye for the first few washes. Wash it with other darks and be careful with pale upholstery at first.
How do I restore faded black jeans?
A black fabric dye made for cotton can bring back much of the color, though the stitching thread may stay lighter. Otherwise, enjoy the grey.
