Short answer: “Permanent,” “demi-permanent” and “semi-permanent” are useful product descriptors, but the words alone do not tell you the exact wear time, lift, grey coverage or developer formula. Read the complete brand and product line, then check its current instructions. A shade chart is not a guaranteed result on an individual head of hair.
Scope: This guide compares published manufacturer information as an example of how to verify a colour claim. It is not an independent performance test, a salon recommendation or a universal definition that overrides the product’s local-market packaging.
What the label can establish—and what it cannot
| Descriptor or claim | What to verify | What you cannot infer from the word alone |
|---|---|---|
| Permanent | Exact formula, developer, mix ratio, application and stated coverage in the matching technical guide. | That the colour never changes, that every shade covers every percentage of grey, or that a different permanent line uses the same mix. |
| Demi-permanent | Manufacturer’s named product line, emulsion/developer, permitted uses, coverage and any stated wash-fade claim. | A fixed number of washes for every person, or that the product is necessarily developer-free. |
| Semi-permanent | Whether the brand uses the term for a direct-deposit product, mask or another specific system; check the package and current instructions. | A universal duration, identical chemistry across brands, or suitability for all hair histories. |
Use a real product line to see why the details matter
Wella’s own published material calls Color Touch a demi-permanent line and Koleston Perfect a permanent line. Its product pages also classify Color Fresh Create as a semi-permanent expressive colour palette. These are the manufacturer’s descriptions of its named products; they are not a claim that every brand’s products behave the same way.
Koleston Perfect: shade-family instructions vary within one line
In Wella’s published guide, core Koleston Perfect shade groups use a 1:1 colour-to-Welloxon Perfect ratio, while Special Blonde uses 1:2. The guide also gives a 1/3 Pure Naturals addition for the stated 30–50% white-hair range and 1/2 for 50–100%. Wella describes coverage of up to 100% for the product line. Those figures are tied to that manufacturer’s specific shade families, developer and instructions. They cannot be transferred to any other permanent colour—or applied without checking the current local pack.
Color Touch: one line, product revisions and different claims
Wella’s current U.S. Color Touch page describes a demi-permanent result that fades over 28 washes and says Color Touch Plus can give up to 70% grey coverage. A separate Wella technical fact sheet states “up to 24 shampoos” and up to 50% white coverage for the core range. Those published numbers come from different documents and may reflect different product revisions, markets or claim wording. Do not average them or select whichever sounds more persuasive: identify the version and market of the product being used, then follow that exact package and current technical guide.
The difference between “washes” and “shampoos” should also be kept as the source states it. It is not a controlled, head-to-head wear test. Hair porosity, starting shade, application, wash routine and other conditions can affect the visible fade, so a manufacturer’s maximum claim is not an individual guarantee.
Shade, coverage and duration are separate questions
- Shade chart: tells you how a brand organizes level and tone. Shade codes do not have a universal cross-brand meaning.
- Grey-coverage statement: is a product-specific claim and can depend on the line, shade family, starting hair and directions.
- Wash-fade statement: is an attributed manufacturer estimate in its own units and document version; it is not a promise that every client will see the same fade.
- Mixing ratio and developer: are formula instructions. Never copy them from a related product, an older chart or another brand.
A repeatable way to check a colour recommendation
- Record the exact brand, product line, shade code, market and pack revision.
- Check whether the manufacturer calls that line permanent, demi-permanent, semi-permanent, temporary or a toner; do not substitute a generic internet definition for the pack.
- Open the technical guide for the same line and check developer/emulsion, ratio, timing, shade-family exceptions and coverage limits.
- Keep a coverage claim separate from a wash-duration claim. Note the exact wording and unit rather than converting “shampoos” into a guaranteed number of weeks.
- Compare any older document with the current regional product page. If they disagree, show the dated source difference and ask the manufacturer for the current market-specific instruction.
- Follow the product’s safety directions independently of the shade choice. Wella’s Koleston material advises a 48-hour allergy-alert test before each colouration and says an allergic reaction can still be severe; a colour article cannot assess a person’s sensitivity.
What makes this information unusually useful?
Many comparisons repeat the three descriptors as if each had one predictable lifespan. A more reliable comparison records the exact formula, market, source revision, unit and stated conditions. Here the manufacturer’s own Color Touch materials illustrate why even two documents for one named line should not be collapsed into a universal “lasts X weeks” rule. That is a document comparison, not a new laboratory result.
Primary manufacturer sources
- Wella Professionals colour portfolio — manufacturer product-line descriptions, including permanent, demi-permanent and semi-permanent product ranges.
- Wella Koleston Perfect fact sheet — permanent range, product-specific ratio and coverage information.
- Wella Color Touch product page — current U.S.-market wording for demi-permanent classification and fade/coverage claims.
- Wella Color Touch fact sheet — separate published “24 shampoos” wording; compare document version and market before applying it.
- Wella Koleston Perfect shade chart and usage guidance — shade-family ratio and grey-hair instructions.
Manufacturer sources checked 2 October 2026. No colour product, salon service, client hair or wash cycle was independently tested. Product names and instructions change; the current local-market pack and professional guidance take precedence.
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