We use cookies for two reasons: to give you the best experience, and to make sure our ads you see on other sites like Google are relevant to you. Please click the button below if you agree to our use of cookies and personal data – find out more or change settings here.

BioKap Rapid Permanent Hair Dye Natural Brown 4.0 135ml

BioKap Rapid Permanent Hair Dye Natural Brown 4.0 135ml
Price: £14.49 £12.49
Quantity

Brand BioKap
Product Type Hair Colour
Size 135ml

BioKap Rapid Permanent Hair Dye Natural Brown 4.0 is a permanent at-home hair colour for creating a classic, natural-looking brown result with dependable grey coverage. Shade 4.0 is a versatile brunette choice for anyone who wants an even brown finish without pronounced golden, copper or ash tones. With a development time of just 10 minutes, it is particularly convenient for keeping visible roots and greys covered when you want lasting colour without spending a long time on the application process.

The Rapid formula combines permanent colour with conditioning ingredients including Argan Oil and BioKap's Tricorepair complex. This blend of rice proteins, a willow derivative and fruit acids is included to help hair feel softer and look glossy after colouring. Everything is prepared in the supplied applicator bottle, allowing the colour mixture to be directed onto the roots or through the hair according to the enclosed instructions.

Suitable for: Anyone looking for a natural brown permanent hair colour with 100% grey coverage, a balanced brunette finish and a quick 10-minute development time.

Benefits:

  • Classic natural brown: Creates an even brunette result that works well when you prefer a balanced brown rather than a strongly warm or cool shade.
  • 100% grey coverage: Designed to cover visible grey hair for a more uniform-looking colour.
  • 10-minute development: Keeps the colouring process relatively quick, making it practical for regular root maintenance.
  • Soft, glossy finish: Conditioning ingredients help hair feel smoother and look lustrous following application.
  • Easy home application: The applicator bottle and nozzle help you distribute the prepared colour where it is required.
  • Vegan friendly: Suitable for vegans, as stated by BioKap.

Key ingredients and features:

  • Argan Oil: Adds conditioning care to help coloured hair feel soft and look shiny.
  • Tricorepair complex: BioKap's combination of rice proteins, a willow derivative and fruit acids.
  • Dermatologically tested: The formula has been dermatologically tested, as stated.
  • Nickel tested: Nickel testing is stated by BioKap for the Rapid hair colour formula.

How to use:

  • Carry out a skin sensitivity test 48 hours before every use, including if you have coloured your hair previously.
  • Read the enclosed instruction sheet carefully before preparing the colour.
  • Mix the hair colouring cream directly into the Nutrifix colour revealer bottle.
  • Apply the mixture with the bottle nozzle, following the instructions for either root coverage or a complete colour application.
  • Leave the colour to develop for 10 minutes.
  • Rinse thoroughly and use the included after-dye shampoo as directed.

What is included:

  • 1 x 60ml tube of hair colouring cream.
  • 1 x 60ml bottle of Nutrifix colour revealer emulsion.
  • 1 x 15ml sachet of after-dye shampoo.
  • 1 x protective cream sachet for the hairline.
  • 1 x instruction sheet.
  • 1 x pair of disposable gloves.
  • 1 x protective cape.

Good to know: Always follow the enclosed directions and complete the required skin sensitivity test 48 hours before colouring. Keep to the stated application and development time rather than leaving the prepared colour on for longer.

Maintain a timeless brunette shade with BioKap Rapid Permanent Hair Dye Natural Brown 4.0, a useful option for keeping roots and greys looking consistently coloured between salon visits or regular home applications. Its neutral brown character makes it particularly suitable when you want natural-looking depth without strongly contrasting undertones. Order from John And Ginger and enjoy fast UK delivery on qualifying orders and complimentary samples with your purchase.



It is designed to develop in 10 minutes, making it a quick option for at-home colouring and root touch-ups.
Yes, it is described as providing 100% grey coverage for an even, consistent brown result.
The kit includes 1 tube of colouring cream, 1 bottle of colour revealer emulsion, 1 sachet of after-dye shampoo, 1 protective cream sachet, 1 instruction sheet, 1 pair of disposable gloves and 1 protective cape.

Why this rapid natural brown hair colour suits quick home colouring
Fast 10 minute colour

The rapid formula develops in around 10 minutes, making it practical for root touch-ups or a full colour refresh at home.

Natural brown result

Shade 4.0 gives a natural-looking brown finish that feels wearable, glossy and easy to maintain.

Grey coverage support

The permanent colour is designed to cover greys, helping create a more even look from roots through to lengths.

Conditioned glossy feel

Argan oil and the Tricorepair complex help hair feel softer and look shinier after colouring.

Shade explanation
  • Natural Brown 4.0 is a classic brown shade with a natural-looking finish
  • A good option if you want a deeper brown without choosing black or very dark chocolate tones
  • Works well for covering grey roots or refreshing a similar existing brown shade
  • Designed for permanent colour with a glossy, even-looking result

A useful choice if you want quick at-home colour that looks natural, polished and simple to maintain.

Suitability

Suitable for those looking for a vegan-friendly permanent hair dye in a natural brown tone, including when grey coverage is part of the goal. The 135ml kit is practical for home colouring and includes the colour cream, revealer, after-dye shampoo, protective cream, gloves, cape and instruction leaflet.

Good to know: Always carry out a skin sensitivity test 48 hours before every use, even if you have used hair colour before. Mix and apply exactly as directed in the leaflet, leave to develop for 10 minutes, then rinse thoroughly and use the included after-dye shampoo.