KEZY Involve Biphasic One neutralizing developer for tone-on-tone hair colouring, 1000 ml

Name: KEZY Involve Biphasic One neutralizing developer for tone-on-tone hair colouring, 1000 ml
Brand: KEZY
SKU: 5K60005
Availability: InStock

Reference 5K60005

In stock: >5

Pro only

For gentler tone-on-tone colouring, the developer helps control the oxidation process and achieve a more natural, even result. Buffering agents help keep hair feeling protected, while with the appropriate colouring method the natural base can be lightened by 1–2 levels and up to 50% grey hair can be covered.

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In the professional Involve tone-on-tone colouring system, Biphasic One provides controlled colour development and lets the result be adapted to the client's hair condition and desired tone. Combined with Involve Color and Biphasic Two, it helps achieve gentler colouring while maintaining a professionally predictable colour result.

Key benefits for hair

Designed for use with Involve Color for a semi-permanent or tone-on-tone result.
Can lighten the natural base by 1–2 levels and provide up to 50% grey coverage.
Buffering agents control oxidant development and help protect the hair and scalp.
Helps keep hair soft and flexible during the technical service.

Active ingredients and formula action

Buffering agents: controls the development of the oxidation process and provides a protective effect for the hair and scalp.

How to use the product?

Mix with Involve Color at a 1:1.5 ratio for a standard mixture or 1:2 when using Involve Super Lightener. Apply to dry hair and leave for up to 20 minutes, then rinse thoroughly.

Care routine and compatible products

For a gentler tone-on-tone system, Biphasic One can be complemented with Biphasic Two: this restructuring additive lowers the mixture's pH and reduces its ability to lighten natural hair. Use only in the proportions specified by the manufacturer.

Technical information

Brand: KEZY
Range: Expertise
Produkta tips: neutralizing developer
Tilpums: 1000 ml
pH: 2,0–3,0
EAN / GTIN: 8027483600055
model: 5K60005

Product story

KEZY Expertise is a professional technical product range focused on controlled salon work, clearly defined product functions and mutually compatible treatment steps. In this system, colouring, bleaching and perming products are not isolated products chosen at random — they complement one another so the stylist can select a process suited to the specific hair base and desired result.

The formulas use targeted conditioning complexes and supporting ingredients that help maintain hair elasticity, moisture, shine or structural comfort during technical services. This is especially important when the hair needs a visible transformation while still retaining a controlled, professional feel after the service.

The practical value lies in predictable application: the manufacturer specifies mixing ratios, processing time and compatible products. The range is therefore best used as a professional system, following the instructions for each product and choosing the appropriate KEZY supporting products.

Who is the product suitable for?

For professional use in hair salons.
For KEZY Expertise technical hair services.

Frequently asked questions

What is KEZY Involve Biphasic One neutralizing developer intended for?

For a semi-permanent colour result together with Involve Color.

How do you use this neutralizing developer?

Mix with Involve Color at a ratio of 1:1.5 for a standard mixture or 1:2 with Super Lightener. Apply to dry hair and leave for up to 20 minutes, then rinse.

What is the pack size?

1000 ml.

Volume: 851- and more ml
Usage: For coloring and perms
For professionals
Collections: INVOLVE

About Kezy

Kezy is an Italian professional hair beauty brand built around Italian style, simplicity and practical solutions. The brand describes its products as 100% Made in Italy and offers everyday haircare alongside styling and technical products designed for professional services. Its streamlined approach is intended to make choosing and using professional hair products straightforward.

The Kezy portfolio addresses several specific hair needs, including dryness, damage, colour maintenance, lack of volume in fine hair, blonde hair tone management and scalp balance. Its product families provide clearly differentiated options for both salon professionals and consumers building a focused home haircare routine.

What is Kezy known for?

Kezy organises many of its ranges according to hair type and desired result. Coconut, formulated around coconut water, is designed for coloured and treated hair and aims to help maintain cosmetic colour intensity. Macadamia is based on macadamia oil and targets damaged and dull hair, while Macadamia + combines macadamia oil with hyaluronic acid for damaged hair requiring additional hydration and conditioning.

Avocado uses avocado oil and is intended for dry and dehydrated hair. Bamboo contains bamboo extract and has been developed for fine and thin hair requiring greater body and volume. The brand also offers the Scalp range for different scalp needs and the multifunctional * 18 in 1 spray mask.

Kezy products

Kezy haircare includes shampoos, conditioners, masks, sprays and leave-in treatments. Depending on the range, products are formulated for concerns such as colour maintenance, dryness, damage, lack of volume and unwanted warm tones in blonde hair.

Expertise and Creativity

For salon technical services, the Expertise range includes permanent colour cream, oxidising emulsions, bleaching powders and waving products. This places Kezy beyond everyday maintenance and into professional colouring and chemical service categories.

The Creativity collection focuses on styling. It includes hairsprays, volumising mousses, curl styling gel and modelling waxes with different finishes and levels of hold, providing options for volume, definition, texture and finishing.

Who are Kezy products suitable for?

Kezy is relevant to customers looking for professional haircare organised around clear hair needs and to hair professionals requiring care, styling and technical products. Its ranges cover dry, damaged, colour-treated, blonde, fine and thin hair as well as selected scalp concerns, allowing products to be chosen according to hair condition and the desired result.