提醒一下哈, 现在市面上的意大利醋(Balsamic Vinegar of Modena)一般都含有色素(coloring),

真正的Balsamic Vinegar of Modena要发酵12年，一般商家为了达到仿真的效果，会添加色素和粘稠剂。那些价格达10多美刀／欧元的意大利醋里也会含有色素(coloring)。en.wikipedia.org/wiki/Balsamic_vinegar

Wiki上讲如何从瓶盖颜色上分辨真正发酵了12年和25年的Modena醋： Modena uses a different system to indicate the age of its balsamic vinegars (Aceto Balsamico Tradizionale di Modena). A white-coloured cap means the vinegar has aged for at least 12 years and a gold cap bearing the designation extravecchio (extra old) shows the vinegar has aged for 25 years or more.