Getty A new, sleek pair of dark jeans is an outfit staple that can instantly make you feel put-together and polished — until you realize the deep dye has bled onto your hands, sweater, and ack! But be sure to take extra-special care around leather pieces. Here's how to prevent this annoying dye transfer: First, forget your mother's trick of soaking denim in a solution of vinegar or salt and water to set the color — it won't work like it might have girls farting in jeans ago. And if you're worried about fading your new denim before you get a chance to show it off, use a special detergent formulated to preserve dark colors. If you do spot a blue shadow on your cream-colored couch, try.