The environment surrounding your tasting experience, including the time of day, may affect your judgement of the wines you taste.
Since it takes time for your mouth to adjust to alcohol and acidity in wine, initially the first few sips of wine may have a crude taste.
It is difficult to establish a clear sense of a wine’s aroma when strong competing smells exist such as, cologne or cooking spices. Other factors that will influence the taste of the wine include the shape of the glass, the age of the wine, as well as the temperature of the wine.
Counter acting negative as much as possible allows the wine to present independently for a more accurate evaluation of it. Separate yourself from areas with strong aromas, cup the bowl of the glass in your hand if the wine is to cold, and condition the glass by rinsing it with a bit of wine around the bowl if the smell of it seems dank.