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If you're trying to maintain silver hair that isn't natural, shampoo your hair immediately after bleaching it and condition your hair right after coloring it. After this initial shampooing and conditioning, leave your hair alone for 1 week so that it can recover and replenish any lost oils. If you wash your hair immediately after coloring your hair, then you risk dryness or breakage. Apply coconut oil to your hair, making sure to distribute it evenly. Leave it in for 1 hour, then wash it out with shampoo. You can also use a hair mask instead, as long as it can be used on dry hair. Leave the mask on for 5 minutes, or the time recommended on the bottle.  For best results, use virgin, cold-pressed, un-refined coconut oil. Cover your hair with a shower cap to keep your surroundings clean. Focus the shampoo on your roots and scalp, and the conditioner on the mid-lengths and ends of your hair. Remember to leave the conditioner in your hair for 1 to 2 minutes before rinsing it out. Sulfates are a common ingredient in shampoos and conditioners. They can make your hair feel dry and fade hair dye. Choose a mask meant for color-treated hair. Wash your hair with shampoo, then rinse it out. Apply the mask to your hair while it is still wet. Wait 3 to 5 minutes, then rinse the mask out.  Use a sulfate-free hair balm if your hair is naturally gray. If you can't find a hair mask meant for color-treated hair, look for a hydrating or repairing one. Check the ingredient label to ensure that it is free of sulfates. Hot water is very damaging to hair, and even more so on dyed hair. It can also cause your hair color to fade faster. You can make your hair color last longer by using cool to lukewarm water to wash and rinse it. The lower temperature will also help your hair appear sleeker and smoother. Rinse your conditioner out with cool water to seal the cuticle and lock in moisture. Gray hair dye fades faster than most, so the less often you wash your hair, the longer your color will stay. If your hair is not very oily, wash it once per week. If your hair tends to get very oily, wash it no more than twice per week. Use dry shampoo in between washes if your hair starts to look oily and dirty.

Summary:
Wait 1 week after dyeing your hair silver to wash it again. Pre-condition your hair before washing it. Use color-safe, sulfate-free shampoos and conditioners. Deep-condition your hair 1 to 2 times a week with hair masks. Use cool or lukewarm water to wash and rinse your hair. Limit washing your hair to once or twice per week.