(19)

(11)

EP 3 033 443 A2

(12)

(88) Date of publication A3: 23.07.2015 (43) Date of publication: 22.06.2016 Bulletin 2016/25 (21) Application number: 14836690.9 (22) Date of filing: 15.08.2014

(51) International Patent Classification (IPC):  C25C 3/02(2006.01) C25C 7/00(2006.01) C25C 3/04(2006.01) (86) International application number: PCT/ZA2014/000038 (87) International publication number: WO 2015/024030 (19.02.2015 Gazette 2015/07)

(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 Designated Extension States: BA ME (30) Priority: 16.08.2013 ZA 201306171 (71) Applicant: CSIR 0001 Pretoria (ZA)	(72) Inventors: VAN VUUREN, David Steyn 0181 Waterkloof (ZA) TERBLANCHE, Dewald 0081 Pretoria (ZA) SWANEPOEL, Eugene 0181 Pretoria (ZA) (74) Representative: Appleyard Lees IP LLP  15 Clare Road Halifax HX1 2HY Halifax HX1 2HY (GB)