As a result of being aged in wooden casks, the insides of which have been charred, bourbon are usually darker than Scotch whiskies.

• 这两种威士忌都采用橡木桶熟化，但由于使用内侧碳化的橡木桶陈酿波本威士忌，因此色泽比苏格兰威士忌深一些。