I'm not the expert you were waiting for btw, but here goes.
Imho there are a number of reasons why this may have occurred (stronger alcohol smell rather than scent) but it all depends on the chemical composition of the solution and the environmental conditions, your discernment as to scents may have improved also, but my money is on hard, real, chemistry playing a role.
If your Aftershave is made from Essential Oils then my thinking is:
Oxidation has occurred due to temperature increase, oxidation in simple terms causes chemicals to rot - it involves electrons and oxidation states and I nominate
@TomG or
@alfredus to explain it, in detail...
In a bottle of aftershave what in effect happens is that the alcohol expands in the bottle in response to an increase in temperature creating greater atmospheric pressure inside than outside, the alcohol responds by forcing some of the solution out of the bottle through the sealed bottle cap, when the temperature then drops a vacuum is created inside the bottle that sucks air into the solution introducing oxygen. Think of it as the bottle being like a lung, taking air in and out over time.
It is this air that causes oxidation of the organic compounds and over a period of months if the temperature rises and falls time and time again the rate and level of this will increase to a threshold where the organic compounds that impart the scent are in effect all rotting and degrading and therefore losing their smell consequently the alcohol smells stronger and due to less ''scent chemicals'' being present you lose the smell much faster after it's put on your face.
Now all this only applies as far
as I am aware to essential oil compounds, it may occur with the aromatic chemicals in fragrance oils (or they may be less stable to begin with) but I have done little to no reading on them as they are not so relevant to my efforts with APR and there is around 5000 of them that all behave differently depending on their structure, etc.
