If you're looking for bright or colored dyes for your hair, you might want to start with a temporary hair dye. Using a temporary dye lets you enjoy the color without the long-term aspect of a permanent dye. You can also use unconventional hair dyes like Jell-O to experiment. Even if you have brown hair, make a Jell-O paste in your color of choice and use that as temporary hair color.
Combine the water with the Jell-O powder in a bowl. Long hair might require doubling the recipe. Mix the dye until it is a thick liquid.
Divide the hair into two sections. Keep the top layer of the hair secure with a hair clip.
Dip a small paintbrush into the dye. Apply the dye to the bottom section of the hair. Thoroughly saturate the bottom section.
Release the top layer of hair. Apply the dye, saturating this layer of hair, as well.
Tie your hair into a bun on the top of your head using a hair tie. Fit a hair cap over your entire head.
Leave the dye in your hair for at least 10 hours. Because this is not real hair dye, it needs a long time to set.
Rinse the color out until the water runs clear. Style your hair as usual.