Jemella Limited

Liam Wright

Timothy David Moore

Robert Alexander Weatherly

Roger James Williamson

Alex Harrison

Anthony Sargeant

Tim Hone

Simon Godfrey

Mathias Herrlein

Hendrik Riedel

Matthew James

Ed Surridge

Richard Gold

Luca Nogarotto

Adam Stone

The present invention relates to a method for dyeing hair fibres, in particular a method which involves coating hair fibres with a hair dye composition and directing radio frequency electromagnetic radiation to the coated hair fibres to cause heating within the coated hair fibres by dielectric loss. The present invention also relates to kits and appliances for use in connection with the method, as well as the use of radio frequency electromagnetic radiation in reducing the effective dye-treatment time for hair fibres. In one aspect, there is provided a method of dyeing hair fibres, said method comprising the steps of: i) coating one or more hair fibres with a hair dye composition; and ii) directing radio frequency electromagnetic radiation having one or more frequencies from 1 MHz to 300 MHz to the one or more coated hair fibres to cause heating within the one or more coated hair fibres by dielectric loss. Preferably, the hair dye composition used in step i) is a permanent or demi-permanent hair dye composition that may be prepared by combining a dye lotion containing one or more dye precursors and an activator solution containing an activating agent, wherein the activating agent in the activator solution converts the one or more dye precursors in the dye lotion to active dye agents.

Method and apparatus for dyeing hair fibres using radio frequency electromagnetic radiation

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Cambridge, United Kingdom

Liam Wright