If you’re using permanent dye, apply it to your hair when it’s dry. For semi-permanent dye, shampoo your hair and dye it while it’s still slightly damp. [1] X Research source

If your hair is longer than shoulder-length, buy at least 2 boxes of dye in case you run out during the process. You should only need 1 box if your hair is shoulder-length or shorter.

You can also lay down newspaper or garbage bags to protect floors and surfaces from dye stains. [4] X Research source Work in a room with natural light if possible, so you can accurately check your new hair color. [5] X Research source The bathroom is generally the best place to work, especially if you have a window that lets in natural light. You can use the mirror to check up on your progress, use the countertops as a workspace, and the sink and shower are readily available in case you need to rinse off.

Not all kits have the same mixing ratio (for example, some might require a 1:1 mixture of color and developing cream for the strand test), so check the instructions before you start mixing the dye. If you’ve dyed your hair before, work the dye from root to tip, taking care not to get dye on your scalp.

If you’re not happy with your test strand’s color, you can try a new color on a different strand of hair.

Remember to remove any jewelry you don’t want to get dye on, like earrings or rings.

If you have very thick hair, you can divide your hair into 6 sections.

You can find bowls and brushes for hair dye at supermarkets or beauty supply stores.

Your roots need the most color and processing time, so it’s best to apply dye there first, and work your way downwards. Ask a friend to help you apply dye. Certain areas, like the back of your head, can be tricky to do on your own.

Dye and comb the remaining sections until you’ve applied dye to all your hair.

You can even use a plastic shopping bag to cover your hair. Wrap it around your head and clip it in place so that it stays put. [15] X Research source

Take off the disposable gloves you used to apply the dye, and use a fresh pair of gloves for washing it out. [17] X Research source

The conditioner that comes in dye kits is specially formulated for color-treated hair.

Your hair will likely look significantly darker while it’s wet, then brighten up when it dries. If you’re not happy with your hair color, it’s best to see a salon colorist who can help you fix it.

Use dry shampoo in place of liquid shampoo to help maintain color even more. [24] X Research source

Rinse and condition all of your hair after you’ve let your hair dye develop in your roots.