In a base of dilute ethanol ( 70 % -90 % ) , eau de cologne contains a mixture of citrus oils including oils of lemon , orange , tangerine , bergamot , lime , grapefruit and neroli .
In a base of dilute ethanol ( 70-90 % ) , Eau de Cologne contains a mixture of citrus oils including oils of lemon , orange , tangerine , bergamot , lime , grapefruit and neroli .