Things You Will Need
Carpet dye is one feasible and inexpensive solution, especially if you have wool carpeting or a wool-polyester blend. Wool absorbs fluids, like dyes, much more easily and permanently than 100 percent synthetic fibers. Set aside a weekend for the project, as it requires time, planning and patience.
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Purchase a carpet dye in the color you want. If your carpet is light, you can choose any color you like; for darker carpets, purchase a dye that matches the existing color to brighten faded spots and renew the carpet’s look. Choose chrome dyes; these last the longest without wearing on your carpet.
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Clear everything from the piece of carpet you want to dye and vacuum it thoroughly. Mix the carpet dye in a plastic tub with white vinegar according to package instructions.
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Soak a sponge in the dye and wring it out so it no longer drips. Press the sponge into the corner of the carpet, squeezing dye into it. Set the sponge into the tub and let the test spot dry. If the spot isn't the color you want, add more vinegar or dye to make it lighter or darker and retest.
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Sponge the dye into the carpet, beginning in the corner and working your way back and forth along the floor. Try not to overlap dye rows so the color remains uniform. If treating faded spots on a dark carpet, treat the spots only. Allow the dye to dry for at least 24 hours before placing furniture back into the room.