Remove all items, including furniture, from the room. Nothing should touch the carpet.
Vacuum the carpet to remove dirt and debris. Shampoo the carpet with a carpet shampooer at least 24 hours before the dyeing process. Allow the carpet to dry completely before continuing.
Protect baseboards from splatter during the dying process by covering them with plastic.
Mix the carpet dye according to its specific directions.
Add the dye to a pressure sprayer.
Spray the dye over the carpet in long strokes. Keep the strokes from overlapping if possible.
Allow the carpet to dry for 24 to 48 hours before replacing furniture or walking on it.