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Protein fibers, like wool, cashmere, and silk will hold the dye for the longest. Cotton fabric dyes well, but the color generally fades a little bit faster over time. Remember that you can always re-dye items that have faded. Use towels or sheets that you don’t mind getting discolored. You’ll also need a large plastic bowl, white vinegar, water, and various food coloring options. Getting everything together is helpful so that you don't have to go searching for anything while your hands are messy. There are some techniques to remove food coloring stains, but it’s easiest to avoid making them if you can. Place your clothes in the bowl first, and then add enough equal parts of water and white vinegar so that they’re completely saturated. To keep things even, use a measuring cup to add 8 ounces (230 g) of each liquid at a time.  The pre-soak prepares the clothes to accept the dye better than if you were to go straight to water and food coloring. Although you can dye your clothes without soaking them first, the color won't be as vibrant! Dump out the water/vinegar mix, and gently wring out your clothes. Then use 3 to 4 cups (710 to 950 mL) of water (or more, depending on how bulky the clothes are) and 10-15 drops of food coloring. Mix the water and dye in a large bowl and place your wrung-out clothes into the new mixture. If you’re nervous about the color being too dark, start with fewer drops and add more until you get the desired color. Most packs of food coloring have 4 basic color options—blue, green, red, and yellow. Mix together red and blue to make purple. If you want orange, combine red and yellow. Make a beautiful cyan color by mixing green and blue. Experiment with your dyes and water to find the perfect shade for your clothes. If your pack of food coloring comes with white or black dyes, use those to either lighten or darken the mixture to get the color you want. Use a long spoon to push the fabric down in the water to make sure it’s fully submerged, and stir it every few minutes let the dye access all of the material. You could even wear rubber gloves and manually rearrange the fabric every couple of minutes, too. After 10-20 minutes, you will notice that the water is clearer than it was before because the dye is getting absorbed into the fabric. Wring out your clothes after they’ve soaked in the water and dye mixture, and then place each item into its own resealable bag and set them out of the way somewhere. It’s okay if they’re left for longer than 8 hours. The time in the resealable bag makes the dye react with the fabric faster, which gives you a more vibrant, longer-lasting color in the end.

Summary:
Choose a wool fabric if you want your color to last. Lay down old towels and gather your materials together in one place. Place your clothes in a 1:1 mixture of water to vinegar for 30 minutes. Soak your clothing in water and food coloring after the vinegar soak. Mix together 2 or more dyes to create different colors. Let your clothes sit in the water and dye mixture for 10-20 minutes. Put the clothes into a resealable bag for at least 8 hours.