Method related to organic compositions

A computer apparatus arranged to carry out a method of predicting a temporal fragrance profile of a fragrance composition comprising a plurality of fragrance ingredients, the computer apparatus comprising a processor to:

• retrieve a diffusion measure of how fast each fragrance ingredient diffuses into a headspace;
• form groups of fragrance ingredients having a similar diffusion measure;
• determine an olfactive contribution of each fragrance ingredient;
• calculate a total olfactive contribution of a group of fragrance ingredients as a sum of the olfactive contributions of all fragrance ingredients forming the group;
• and comprising a graphical user interface to
• visualizing the temporal fragrance profile by displaying the total olfactive contribution of each group of fragrance ingredients in an order that is based on diffusion measures of the groups of fragrance ingredients, wherein the visualized temporal fragrance profile is defined between a first end and a second end opposite with respect to the first end, a first group of the groups diffuses into a headspace before one or more second groups of the groups diffuse into the headspace, the first group is disposed at or adjacent to the first end of the visualized temporal fragrance profile, and the one or more second groups are disposed between the first group and the second end of the visualized temporal fragrance profile.