Sarah K Rio Blond Neutralizing Mask

Sarah K Professional Hair Rio Blond Neutralizing Mask - pH Balancer - 500ml is where a Rio service actually ends. It is the acid step. Once the Tanino Brazilian Protein has done the smoothing, this mask goes on damp hair, brings the fibre back down to an acid pH of 3.5/4.0, and hands the hair to the iron for the pass that sets the result. Its headline protein is Whey Protein, with keratin, collagen and panthenol working alongside. It carries a violet pigment too, the same one held by the smoothing active. 500 ml, professional use.

At a glance

What it is: the acid finishing mask of the Rio salon protocol
Headline protein: Whey Protein
Hero actives: citric acid, keratin, collagen, panthenol, violet pigment
Core action: brings the hair to an acid pH and closes the service
pH: 3.5/4.0
Format: 500 ml, rinsed with water only, professional use
How to use: damp hair after the protein step, 5 to 15 minutes, water rinse, iron up to 180 degrees

Why a smoothing service has to end on the acid side

A smoothing service leaves the hair alkaline. That is how the fibre has to sit while the actives work: the cuticle lifts, the hair opens, the protein goes where it needs to go. What you cannot do is leave it there. Hair left alkaline reads dull and rough, and on blonde that shows faster than on anything else.

This mask is the correction. Citric acid takes the fibre down to pH 3.5/4.0, which lets the cuticle lie flat again. A flat cuticle is what shine actually is: light bouncing off a smooth surface instead of scattering off a rough one. Keratin, collagen and panthenol condition while it sits. Then the iron seals the whole thing.

Key ingredients

Citric acid: the acid in the balance, holding the hair at pH 3.5/4.0.
Keratin and collagen: the two proteins in the formula, conditioning the fibre while the mask sits.
Panthenol: softness and slip.
Coconut oil: emollience, so the hair does not read dry after an acid step.
Violet pigment (Acid Violet 43): the same colourant carried by the Rio smoothing active.

What to expect

Hair comes out of this step dense and smooth rather than squeaky, and it takes the iron cleanly. Expect shine, and expect the smoothing you already did to hold its shape. What this mask is not is a toner. The violet pigment is in the formula, but the work it does here is acid and pH balance: it will not pull brass out of a warm blonde, and it does not replace a purple shampoo or a gloss. Judge it on how the hair takes the iron and how it throws light afterwards.

Who it is for

Blonde, highlighted and bleached hair closing a Rio service.
Salons that finish properly: the acid step is what separates a finished result from a rushed one.
Hair that needs its shine back after an alkaline process.
Any Rio protocol, whether the kit or the bottles bought separately.

Who it is not for

Hair that is not blonde or lightened: Sarah K Professional Hair Carnival Universal Neutralizing 500ml is the equivalent for the non-blonde system.
Anyone looking for a toner: this balances pH. It is not a purple shampoo and it does not stand in for one.
Anyone avoiding animal proteins: the formula contains keratin and collagen, so it is not vegan.
Anyone sensitive to fragrance allergens: five are declared. Patch test first.

Professional tip

Rinse this one with water only. No shampoo, no conditioner, nothing that drags the pH back up or leaves a film for the iron to cook into the hair. Then work the iron the way the protocol asks: more passes at the roots, fewer at the tips. The roots carry the least product and the most regrowth; the tips have had the most of everything and need the least heat. If the strand test flagged fragile lengths, that is where you ease off.

How to use

Apply to damp hair after the Clarifying Shampoo and the Rio Tanino Brazilian Protein, covering all the hair.
Leave it to act for 5 to 15 minutes.
Rinse well, with water only.
Flat-iron up to 180 degrees Celsius on blond hair, 7 to 10 passes.
Weight the iron more at the roots and less at the tips, until the straightening is even and the shine is intense.

Safety: For professional use. Work in a ventilated space and wear gloves, as with any salon chemical service; an acid formula can sting broken skin. Five fragrance allergens are declared, so run a patch test first. Avoid contact with eyes, mouth and mucous membranes, and stop use at any sign of sensitisation. Keep out of reach of children, and store away from light, excessive heat and humidity.

Using it inside the Rio system

Rio runs in three steps and this mask is the last of them. Sarah K Clarifying Shampoo with Micellar Water 1000ml opens the service and takes the hair back to a residue-free base. Sarah K Professional Hair Rio Tanino Brazilian Protein Smoothing for Blonde Hair - 1000ml does the smoothing itself. Then this mask lands on damp hair, takes the pH down, and the final iron pass sets the result. Between services, the Rio Tanino Shampoo and Conditioner hold it. The mask comes in one size and finishes the system whichever size of the protein you work with.

In short

The acid step: pH 3.5/4.0, and the cuticle lies flat again.
Not a toner: the violet pigment is there, but pH balance is the job.
The iron finishes here: up to 180 degrees, 7 to 10 passes, weighted at the roots.
The whole protocol in one box: Sarah K Professional Hair Rio Tanino Protein Kit 2500ml.

Complete your Rio routine

Sarah K Professional Hair Rio Tanino Brazilian Protein Smoothing for Blonde Hair 1000ml -- the smoothing step this mask closes.
Sarah K Professional Hair Rio Tanino Brazilian Protein Smoothing 500ml -- the same active in the smaller salon size.
Sarah K Clarifying Shampoo with Micellar Water 1000ml -- the step that opens the service.
Sarah K Professional Hair Rio Tanino Shampoo and Conditioner 2x500ml -- home care that holds the result between services.

Frequently asked questions

What does the Blond Neutralizing mask actually do?

It is the acid step. A smoothing service leaves the hair alkaline, and this mask brings it back down to a pH of 3.5/4.0 with citric acid, which lets the cuticle lie flat and the shine come back. Keratin, collagen and panthenol condition while it sits, and the iron then seals the service.

Does it tone my blonde like a purple mask?

It carries a violet pigment, Acid Violet 43, the same colourant that sits in the Rio smoothing active. But its job is acid and pH balance, not toning. Treat it as the finisher of the blonde system rather than a toner: it will not correct brass, and it does not replace a purple shampoo or a gloss.

Can I skip this step?

Not if you want the service to finish properly. The mask goes on damp hair after the Rio Tanino Brazilian Protein, sits 5 to 15 minutes, gets rinsed with water only, and the flat iron then makes the pass that sets the straightening and the shine. Skip it and the hair stays alkaline.

What flat iron temperature, and how many passes?

Up to 180 degrees Celsius on blond hair, 7 to 10 passes, until the straightening is even and the shine is intense. Always weight the iron more at the roots and less at the tips. On fragile lengths, back off: the strand test earlier in the service tells you how far you can push.

What precautions does the salon need to take?

This is a professional-use product. Wear gloves and work in a ventilated space, as with any salon chemical service, since an acid formula can sting broken skin. Five fragrance allergens are declared, so run a patch test first. Avoid eyes, mouth and mucous membranes, and stop at any sign of sensitisation.

Does it contain formaldehyde?

No. The ingredient list holds no formaldehyde and no formaldehyde-releasing preservative; this mask is preserved with phenoxyethanol. The 0% formaldehyde declaration in the Rio range sits on the Tanino Brazilian Protein that this mask follows. Work in a ventilated space regardless, as you would with any professional service.

Can I use it after another brand's smoothing?

It is specified for the Rio protocol: the Clarifying Shampoo, then the Tanino Brazilian Protein, then this mask. For a system that is not blonde-specific, Sarah K makes a separate Universal Neutralizing for the Carnival line. Using it behind another brand's smoothing sits outside what the protocol covers.

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