679/72 - ‘Vitreous china’ or ‘semi-vitreous china’ which are ceramic products which have been vitrified to a greater or lesser extent, of slightly greyish-white or artificially- coloured ceramic material which is smooth to the tongue: (a) with a degree of porosity (coefficient of water-absorption) not exceeding 3 % measured according to the method set out in Annex; (b) of a density of 2,2 or more; (c) of a translucency, where the thickness is not more than approximately 3 mm, measured according to the me - The Trade Hub