AS NZS 4020 pdf download – Testing of products for use in contact with drinking water 3.2Colour (true colour) The colour produced by a solution containing 1 mg of platinum per litre (in the form ofhydrogen hexachloroplatinate(IV) in the presence of 2mg “of cobalt(II) chloridehexahydrate per litre). NOTE:The unit of colour is the Hazen Unit (HU).3.3Composite product A product in...