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This will help keep your surroundings clean. It will also trap the heat generated by your head and help the dye process faster. You can use this time to wipe off any dye on your skin using a cotton ball and an alcohol-based makeup remover. How long you end up waiting depends on the type of dye you are using, so read the instructions carefully. Most boxed dye kits require you to wait 20 to 25 minutes. Professional dyes typically have a 20- to 45-minute developing time. Don't go over the recommended time, or you risk damaging your hair. Once the time is up, remove the shower cap and clips. Rinse the dye out in the sink or shower using cool water. Do not use any shampoo, or you will risk rinsing the dye out. If the water is too cold for you, you can turn it up to a lukewarm temperature instead. Use the conditioner that came in your dye kit. Apply the conditioner to your hair, wait 2 to 3 minutes, then rinse the conditioner out. Be sure to use cool to lukewarm water for this. If your kit did not come with a conditioner, purchase a silicone-free, color-safe conditioner from the store, and use that instead. It would be best to allow your hair to air dry, but you can blow dry it as well. Avoid heat-styling it for the next couple of days so that it can recover from the dyeing (and bleaching) process. If you must use a curling iron or flat iron, apply a heat protectant to your hair first, and use a low-heat setting.

Summary:
Cover your hair with a plastic shower cap. Allow the dye to develop for the time recommended on the package. Rinse the dye from your hair using cool water. Apply a color-safe conditioner to your hair, then rinse it out. Dry and style your hair as desired.