This topic is for all Cologne related discussions. Cologne is a traditional citrus based type of fragrance also known as Eau de Cologne. This fragrance originates from Cologe and has become one of the most recognisable in male citrus based. There are many modern cologne type fragrances and very large variety of notes associated with cologne type perfume. Cologne is also often referred to concentration of perfume product. Cologne is generally very mild in concentration and provides more freshness than heavy perfume layer.