Curdling, the coagulation of any particular fluid, such as milk. In Tuscany, it is effected by means of artichoke flowers, instead of the rennet employed in Britain. There are, besides, a variety of substances which may be advantageously substitued for either, especially when the whey is intended to be a cooling and antiseptic beverage ; for instance, a small quantity of cream of tartar ; a few drops of cl of vitriol, or spirit of salt, previously diluted in a spoonful of water, will easily coagulate the milk ; after which it should be strained. - See Cheese.