Short answer: “Henna” can describe different products and uses. Before a salon colour service, record whether the previous product was a labelled henna hair dye, another plant-based colour, a conventional hair dye, or body art marketed as “black henna.” Do not infer ingredients from the name or shade: identify the exact product, market and date where possible, then follow the current instructions for the colour system being considered.
Why the product identity matters
A client may use “henna” for a single-ingredient hair-colouring product, a blend, a branded box colour, or a temporary skin decoration. Those labels do not establish that the formulations are the same. Product names and ingredient declarations can also vary by country, revision and sales channel. A salon cannot reliably plan around an ingredient list it has not seen.
The U.S. Food and Drug Administration distinguishes henna used as a hair dye from henna/“black henna” applied to skin as mehndi. FDA says henna is approved in the United States only for use as a hair dye, not direct application to skin; it also notes that the extra ingredient used to darken products marketed as “black henna” is often a coal-tar hair dye containing PPD, which can cause reactions in some people. This describes the FDA’s U.S. framework and a reported pattern, not the verified ingredients of any particular product or a rule for every country.
A product-history worksheet for consultation
- Use: Was the product applied to scalp hair, brows, skin as body art, or somewhere else? Record each use separately.
- Identity: Write the brand, exact product and shade name, market/country, and any lot or version information still available. Keep a photo of the package only with the client’s permission.
- Ingredients: If the package exists, record the ingredient list as printed. Do not convert “natural,” “plant-based,” “henna,” or a marketing claim into a verified formula.
- Timing and sequence: Note approximately when it was used and what other colour or lightening services came before or after. If unknown, write “unknown” rather than filling the gap with an assumption.
- Prior response: Ask whether the client noticed a reaction or an unexpected result and when it occurred. Do not diagnose the cause from appearance or timing alone.
- Planned service: Identify the exact colour system and market instructions the salon intends to use. Check those instructions before deciding what tests or precautions apply.
Questions to ask before applying another colour
- Can you show the product package, ingredient panel or a clear label photo?
- Was it a hair product, a skin decoration, or both?
- Was the “black henna” wording on a body-art product rather than a hair-colour package?
- What other permanent dyes, lighteners, toners or home treatments were used, and when?
- What do the current instructions for this exact salon product require before each use?
FDA says hair-dye labels include caution language and directions for a skin test, and advises following the product directions. Follow the exact instructions supplied with the product being used; do not substitute a salon’s generic rule or rely on a previous test for another formula. If the history is unclear or the client reports a past reaction, pause the colour plan and use the manufacturer’s current guidance; personal health concerns belong with an appropriately qualified healthcare professional.
What this record can and cannot establish
A history worksheet helps the colourist ask better questions and preserve uncertainty. It does not identify an unknown product, prove that two products are compatible, predict a colour result, or replace the specific product instructions. A package photo may help identify a marketed product, but it cannot confirm what was actually applied, whether the product was mixed correctly, or how an individual will respond.
For salon records, note the date of consultation, the client-reported name of the previous product, whether a package was inspected, the exact proposed colour line and the instruction revision/market checked. Keep records under the salon’s privacy and retention practices; do not publish client names, contact details, medical history or identifiable photos as an example.
Sources and jurisdiction
- U.S. FDA: Cosmetics Safety Q&A — Hair Dyes — consumer safety context and directions to follow hair-dye label instructions.
- U.S. FDA: Temporary Tattoos, Henna/Mehndi, and “Black Henna” — distinction between hair-dye use and skin application and information about products marketed as black henna.
- U.S. FDA: Hair Dyes — U.S. regulatory and consumer information on hair-dye ingredients and warnings.
Editorial limits: News Hair Fashion did not inspect a client, package, salon record or formula, and did not test product compatibility. FDA links describe the United States; readers and salons elsewhere must check the rules and manufacturer directions for their own market. This article is an identification and consultation aid, not a diagnosis, formula recommendation or promised result. Sources checked 2 October 2026.
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