Black jeans look awesome when brand new. They have a slimming effect and appear more dressy than regular blue jeans. With a few basic steps you can keep those new jeans looking new without fading the color.
Choose a good quality laundry detergent. Use one without bleach added and made specifically for dark clothes.
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Turn jeans inside out. Wash in cold water instead of warm. Use the shortest wash cycle and preferably the gentle cycle.
Dry jeans on a clothes line instead of in the dryer. If necessary put in the dryer on lowest setting when damp dry; this keeps the jeans from becoming too stiff.
Use black powder clothes dye in the wash to keep the color looking fresh. Add to the wash once a month or as needed. Clothes dye is available at fabric stores and most retail stores.
Do not hang jeans in sunlight to dry.