Hair Colour: Frequently Asked Questions

Can a permanent hair colour be applied over the top of a tone-on-tone hair colour? Can a tone-on-tone hair colour be applied over a permanent hair colour?

Depending on the shade chosen, a permanent hair colour can be applied over a tone-on-tone hair colour such as Casting Crème Gloss providing it has been close to 28 shampoos since you coloured your hair with Casting Crème Gloss. Otherwise, your hair will have build-up of hair dye and the result will be darker than expected.

Casting Crème Gloss can be applied over an existing shade to refresh the colour. It is best to select a shade that matches the existing colour or one that is one to two shades darker. A lighter shade will potentially not be as visible as you would desive, so please keep this in mind when selecting your shade.

For assistance, please call our team of experienced hairdressers in the L'Oréal Paris Advisory Bureau on 1300 659 359, or alternatively email your enquiry to us at [email protected]. They are happy to help you with any of your hair colour queries.

How can I prepare my hair to ensure I achieve the best results possible with L’Oréal Paris hair colour?

L'Oréal Paris hair colour is enriched with many different conditioning ingredients to protect and treat your hair during the colouring process. When using permanent or semi-permanent hair dye, shampoo hair 12-24 hours prior to applying the product to ensure that natural oils are not stripped from the scalp immediately prior to colouring.

Does the length or thickness of my hair influence how much hair dye I will need?

Yes. Hair should be fully saturated by hair dye to achieve the expected results. For hair that is longer than shoulder length, or very thick, more than one box of hair colour may be required for root to tip coverage.

Does hair type affect the hair colour processing time?

Hair type and texture – for example curly or straight, fine or coarse – is a key consideration when colouring hair. The structure of each individual hair differs by hair type; finer hair has a smaller diameter and generally absorbs hair colour quicker, where thicker hair types have a larger diameter and absorb product slower. 

Hair that is chemically treated may also process faster or slower than hair that is not. L’Oréal Paris recommends following the directions on the Instruction Leaflet included in each pack of hair colour.

Can I test a colour on a small section of hair before application?

Yes. Strand testing is when hair dye is applied to a small section of hair to test the results before it is applied to the entire head. Conducting a strand test is an easy way to see the results of the hair dye on your starting hair colour, whether it is natural or already coloured. Testing your chosen colour on a small section of hair is also a way to establish the appropriate processing time for your hair, using the times listed in the Instruction Leaflet as a guide. Strand testing directions are listed within the Instruction Leaflet included in each pack of hair colour.

How do I care for my hair after colouring?

For ongoing care of your hair and its colour, it is recommended to use shampoos and conditioners specifically formulated to protect your hair and prolong your colour’s radiance. Regular deep conditioning masques and treatments will help maintain and retain your hairs moisture and vitality so that when you do colour, your hair absorbs the colour evenly and the end result is perfect from root to tip. The L'Oréal Paris ELVIVE Colour-Protect range is specifically formulated to protect your hair and prolong your colour’s radiance and shine. This range ensures your hair and its colour is in the best condition before and after colouring your hair. For more hair care tips, discover our FAQs here.

Regular trims to remove dry and split ends will also assist in keeping your colour looking rich and shiny.

How long will my hair colour last?

The amount of time your hair colour will last varies depending on the hair colour type chosen. 

As the name suggests permanent hair colour, including Préferénce & Excellence, will provide long lasting colour with a retouch required once the hair has new growth. 

Hair coloured with long-lasting semi-permanent dye, or ‘demi colour’, will gradually fade with each shampoo, but generally last around 28 washes. This includes Casting Crème Gloss

Semi-permanent colour, including Age Perfect and Colorista Semi-Permanent will last around 10-20 shampoos. For instant root coverage that will wash out with one shampoo use Magic Retouch.

How can I remove hair dye and hair colour staining from my skin?

Apply a small amount of an alcohol-based product such as mouthwash, after-shave or fragrance to cotton wool and gently rub affected areas. Follow up by wiping with water and applying a little face moisturiser. To prevent colour staining for future applications, apply a little moisturiser or Vaseline to your hairline before you apply the colour, ensuring you do not get it on the hair as it can also prevent the colour from taking in those areas.

Which L’Oréal Paris hair colour will cover grey hair?

For 100% grey coverage choose from a range of blonde, brown, black and red tones in the Excellence Creme Permanent Hair Colour. To temporarily cover grey hair at the roots, choose Magic Retouch.

How do I choose a shade that will suit me?

We recommend that you select a shade that sits within two shades of your natural hair colour, either darker or lighter. By using this process, you will achieve a result that harmonises well with your natural skin and eye colouring and is easy to maintain for follow-up applications. To test your hair colour before committing, try our virtual hair colour try on technology, Modiface.

How often should I do a re-touch application?

This depends on how quickly your hair grows (the average rate of growth is approximately 1cm or ½ inch per month), so around every 5 to 6 weeks. For colours that gradually shampoo out of the hair such as Casting Crème Gloss, re-application will depend on the frequency you shampoo your hair.

I have lightened my hair to a light blonde and now want to change my hair colour back to my darker natural colour, how do I do this?

A two-step application is essential to replace the warmer gold or red pigments that were removed during the lightening process before applying the new darker shade. Failure to do this can result in your hair looking matte or greenish. For more information and advice, please call our team of hairdressers in our Advisory Bureau on 1300 659 359.

If I already have a permanent colour in my hair and I want to use a lighter colour hair dye will it work?

A lighter permanent colour cannot lighten existing colour pigments already present in the hair. A two-step process may be required to remove some of the existing colour using a lightening product before you can apply the new shade. For advice on how to achieve this, please call our team of hairdressers in our Advisory Bureau on 1300 659 359.

How do I fix hair colour that is too dark?

When hair dye results in a darker colour than expected, repeated shampooing with a medicated/anti-dandruff shampoo can help remove some hair, but not all of the colour pigments. Apply to damp hair, lather and leave lather for a few minutes, repeat applications (approximately 3 – 6 times) until desired shade is achieved. Follow with a rich conditioner or deep conditioning treatment. For more advice, call our hairdressers in the Advisory Bureau on 1300 659 359.

Is it important to do the hair dye sensitivity/intolerance test recommended in all the L’Oréal Paris hair colour packs?

Yes absolutely. Whilst allergic reactions are very uncommon, it is important to conduct the sensitivity test at least 48hrs before you mix and apply the colour. More specific information on how and where to conduct this test is on the Instruction Leaflet included in each pack of colour.

There are so many different L’Oréal Paris hair colour ranges available; how do I know which range is best for me?

This depends on the result you want to achieve, grey coverage, adding reflects or tones, lightening or deepening or covering first greys. Each range is designed to help you achieve a specific colour result. Choose from Casting Crème Gloss, Excellence, Preference, Colorista and Magic Retouch

What is the difference between a Crème and Gel formulation?

Crème formulas give a more intense solid colour result and are great for covering greys. Gel formulas provide intense colour in a more translucent result that blends the colour with your hair’s natural highs and lows. Some products are a Crème/Gel, blending the best of both technologies, softer grey coverage with a slightly more translucent result.