Japan Toy Association (JTA) approved the 5th revision of ST 2012 on 26 November 2015 and put it into effect on 1 January 2016. Regarding the revision, test method of formaldehyde under Part 3 Clause 1.6 was aligned with that in “Act for the Control of Household Products Containing Harmful Substances” which was announced by the Ministry of Health, Labour and Welfare (MHLW) on 9 July 2015. In which, ammonium acetate buffer solution should be used instead of using purified water during the absorbance measurement process.