When Bertil's father died in 1973, his nephew Carl XVI Gustaf ascended the throne.
Bertil's two other brothers had already relinquished their places in the line of succession by marrying commoners.
Prof Bertil Fredholm, an expert in pharmacology and physiology at Sweden's Karolinska Institute, said the findings were reassuring for coffee-lovers.
Prince Bertil was popular in Sweden where he was dubbed "Prince Charming" by the media for his long romance with Lilian.
In 1943, she met Prince Bertil at the Les Ambassadeurs nightclub in the English capital, where he was stationed at the Swedish embassy.
Bertil once said that one of his biggest regrets was that the couple had to sacrifice having children in order to protect the throne.
In 1947, Bertil's eldest brother, Crown Prince Gustaf Adolf, died in a plane crash, leaving behind an infant son who would one day inherit the throne.
Hugely popular in Sweden for his romance with Lilian and known as "the prince of cars" for his love of fast vehicles, Bertil died in 1997 aged 84.
The prince's father, King Gustaf VI Adolf, refused to give his blessing to a marriage between Bertil and Lilian, so as not to jeopardise the future of the monarchy.
Michael Nyqvist plays a slightly boring journalist named Blomkvist, who is hired by a rich old man (Sven-Bertil Taube) to probe the disappearance of a teen-age girl, forty years before.
And once the new king married in 1976, one of his first moves was to allow Bertil and Lilian to marry, which they did in December 1976, 33 years after meeting.
Cosmetics Europe chief Bertil Heerink, quoted by the Associated Press news agency, said that "by implementing the ban at this time, the European Union is jeopardising the industry's ability to innovate".
Prince Bertil's two brothers had already renounced their right to the throne by marrying commoners and the only heir, his older brother Crown Prince Gustaf Adolph, died in a plane crash in 1947.
Her funeral is to be held on Saturday at the palace, and she will be laid to rest at the royal burial grounds in Haga Park on the outskirts of Stockholm, next to Bertil.
With a strong possibility that Prince Bertil would have to act as Regent to the present King Carl XVI Gustaf, who was less than a year old when his father was killed, the couple did not marry.
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