Step 1
Take the furniture out of the room with the Berber carpet you intend to dye. You will then need to vacuum as spots under the furniture have probably not be vacuumed in a while. Don't forget the hose attachment to vacuum the baseboards and corners.
Step 2
Rent a carpet shampooer to clean your carpets before you dye them. You can also borrow one from a friend or hire someone to clean the carpet.
Step 3
Apply painter's tape around the edges of the baseboards where the baseboards meet the carpet. This will keep the dye from ruining the baseboards.
Step 4
Order Berber carpet dye (see resources). Select a dye that is a darker color than the color of the carpet that you already have. If it is lighter, it may not take.
Step 5
Follow the directions on the dye bottle. The dye comes in a concentrated form and must be mixed with water before application can begin. The product label will tell you how much water with how much dye. You may want to mix it in a bucket.
Step 6
Apply the dye with a brush. Rub it in circular motions until that section turns the color you want it. Then move on to the next section. Begin at the farthest end of the room and work your way out. Otherwise, you are likely to get trapped in the room and end up walking out which will get dye on your feet, socks, or shoes.
Step 7
Let the Berber carpet dry out for 24 to 48 hours before bringing the furniture back in. If you think the carpet would look better darker, go ahead and add another coat.