Food coloring can color some materials in craft experiments, but it is not a universal replacement for textile dye. A food product’s intended use does not establish washable color, light resistance or compatibility with a finished garment.
Fiber matters
Protein fibers and cellulose fibers respond differently to dyes. A successful wool-yarn experiment should not be treated as proof that the same mixture will work on a cotton shirt or polyester dress. Identify the sample before choosing a method.
Keep experiments separate from wardrobe promises
Use small expendable samples and record the food-color product, material and process. Check the dried result and subsequent washing. Avoid claiming that a shade is permanent merely because the rinse water looks clear.
Follow a documented craft method
The University of California’s wool-coloring activity is an example of a specific educational project. It describes raw wool for craft uses; it is not a general garment-dyeing recipe. Match the actual material and purpose when following an activity.
Do not add a universal “setting” mixture
Vinegar, salt and baking soda have different roles in specific processes. None is an automatic way to make every food color bind to every fabric. Heating or soaking can also exceed garment care limits.
For washable clothing, compare textile products
If the goal is a repeatable clothing project, select a product whose instructions identify the fiber and finishing process. Read our home dyeing guide or compare clothes dyeing services for a difficult item.