At-home hair color comes with instructions that are easy to skip. This is a guide to reading them.
In brief
- Many hair color boxes include a patch test instruction. Follow it exactly.
- Never skip the warnings, and keep products away from eyes.
- If you are unsure, ask a licensed stylist or clinician.
Why the box talks about a patch test
Hair color products are made of ingredients that can cause reactions in some people. The directions in the box commonly say to do a small skin test, often behind the ear or on the inner forearm, a set time before using the color. The exact method differs by product, so follow the directions on yours.
What to read on the box
| Look for | Why it matters |
|---|---|
| Patch test instructions | Tells you how and when to test before using the color. |
| Mixing and timing directions | Leaving color on longer than directed is not a shortcut. |
| Warnings | Cautions about eyes, eyebrows, and previously treated hair. |
| Ingredient list | Lets you check for something you already know you react to. |
A calm checklist before you start
- Read all the directions before opening anything.
- Do the patch test as directed, and wait as long as it says.
- Set out gloves and old towels, and set a timer.
- Work in a ventilated room.
- Rinse as directed, and store or dispose of leftovers as the box says.
When to stop and ask
If a patch test or the color itself causes stinging, swelling, blistering or a rash, stop, rinse as the directions describe, and ask a pharmacist or clinician. For anything beyond a simple at-home change, a licensed stylist can help. This site explains labels; it cannot assess you.
General information only. Dewvira is not a medical provider, clinic, pharmacy, or retailer, and this is not medical, professional, or financial advice. Products and labels change. Check the packaging in your hands and ask a qualified professional about your own hair, scalp, or skin.