(19)

(11)

EP 2 709 469 A1

(12)

(43) Date of publication: 26.03.2014 Bulletin 2014/13 (21) Application number: 12726467.9 (22) Date of filing: 18.05.2012

(51) International Patent Classification (IPC):  A24B 15/26(2006.01) C10L 1/04(2006.01) (86) International application number: PCT/GB2012/000453 (87) International publication number: WO 2012/156679 (22.11.2012 Gazette 2012/47)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 19.05.2011 GB 201108436 (71) Applicant: Royal Holloway And Bedford New College Egham, Surrey TW20 0EX (GB)	(72) Inventors: FRASER, Paul David Egham Surrey TW20 0EX (GB) MORTIMER, Cara Egham Surrey TW20 0EX (GB) (74) Representative: Humphrey-Evans, Edward John  Humphrey-Evans Intellectual Property Services Limited 1 Hawkes Close Wokingham Berkshire RG41 2SZ Wokingham Berkshire RG41 2SZ (GB)