# US 2014/0190508 A1 · Method

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- Number: US 2014/0190508 A1
- Document ID: US20140190508A1
- Status: Published application
- Kind: A1
- Application number: 14/235,788
- Filed: 2012-07-27
- Published: 2014-07-10
- Earliest claimed: 2011-07-29
- Assignees: Perachem Limited
- Inventors: Jamie Anthony Hawkes; David Malcolm Lewis; John Mama
- Web page: https://patentgrep.com/patent/US20140190508A1

## CPC

- A61K 8/40: containing nitrogen (quinones containing nitrogen A61K8/355)
- A61K 8/22: Peroxides; Oxygen; Ozone
- A61K 8/23: Sulfur; Selenium; Tellurium; Compounds thereof
- A61K 8/46: containing sulfur (A61K8/44 takes precedence)
- A61K 8/676: {Ascorbic acid, i.e. vitamin C}
- A61Q 5/08: Preparations for bleaching the hair
- A61K 2800/884: Sequential application
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS

## Abstract

A method of removing colour from hair that has been oxidatively dyed, the method comprising the steps of: (a) contacting the hair with a composition comprising a sulfur-containing nucleophile or a precursor thereof; (b) contacting the hair with an acidic composition; and (c) contacting the hair with an oxidising composition; wherein there is no rinsing step between step (a) and step (b).

## Claims

### Claim 1

A method of removing colour from hair that has been oxidatively dyed, the method comprising the steps of:
(a) contacting the hair with a composition comprising a sulfur-containing nucleophile or a precursor thereof;
(b) contacting the hair with an acidic composition; and
(c) contacting the hair with an oxidising composition;
wherein there is no rinsing step between step (a) and step (b).

### Claim 2 (depends on 1)

A method according to claim 1 wherein step (a) comprises contacting the hair with a sulfur-containing nucleophile selected from a group consisting of: thiocyanate, thioglycolic acid, thiocarbamate, carbamoylsulphinic acid, thioethanol, and mixtures and/or salts thereof.

### Claim 3 (depends on 1)

A method according to claim 1 wherein step (a) comprises contacting the hair with thiourea dioxide or sodium hydrosulphite.

### Claim 4 (depends on 1)

A method according to claim 1 wherein step (a) comprises contacting the hair with a salt of sulphoxylic acid of formula HSO2−+M wherein M is selected from a group consisting of: hydrogen, an alkali metal, and a quaternary ammonium species.

### Claim 5 (depends on 1)

A method according to claim 1, wherein the composition used in step (a) comprises thioglycolic acid.

### Claim 6 (depends on 5)

A method according to claim 5 wherein the composition used in step (a) comprises thioglycolic acid and formamidine sulfinic acid.

### Claim 7 (depends on 1)

A method according to claim 1, wherein the composition used in step (a) comprises urea.

### Claim 8 (depends on 1)

A method according to claim 1, wherein the composition used in step (b) is a reducing composition.

### Claim 9 (depends on 1)

A method according to claim 1, wherein the hair is rinsed following step (b) with hot water and then contacted with the oxidising composition used in step (c).

### Claim 10 (depends on 1)

A method according to claim 1, wherein the composition used in step (c) comprises hydrogen peroxide.

### Claim 11

A kit for removal of colour from hair that has been oxidatively dyed, the kit comprising:
(i) a first composition comprising a sulfur-containing nucleophile or a precursor thereof;
(ii) a second acidic composition; and
(iii) a third oxidising composition.

### Claim 12

A kit for removal of colour from hair that has been oxidatively dyed, the kit comprising:
(i) two or more precursor compositions which on admixture form a first composition comprising a sulfur-containing nucleophile or precursor thereof;
(ii) a second acidic composition; and
(iii) a third oxidising composition.