In April 2015, nearly five years after the bottles were first found, researchers led by Philippe Jeandet, a professor of food biochemistry, released the findings of their chemical analyses of the Champagne, and particularly noted the fact that, although the chemical composition of the 170-year-old Champagne was very similar to the composition of modern-day Champagne, there was much more sugar in this Champagne than in modern-day Champagne, and it was also less alcoholic than modern-day Champagne. The high sugar level was characteristic of people's tastes at the time, and Jeandet explained that it was common for people in the 19th century, such as Russians, to add sugar to their wine at dinner. It also contained higher concentrations of minerals such as iron, copper, and table salt than modern-day Champagne does.