Answered by: Ustadha Umm Abdullah
Is marc de champagne ingredient in thorntons premium chocolate halal?
بسم الله الرحمن الرحي
Marc de Champagne is a brandy made as a by-product of the Champagne making process by using the discarded seeds and skins.
Brandy is an alcoholic drink that contains 30%-60% alcohol typically extracted from fermented grapes, apples and other sugary fruits. 
Chocolates that contain this ingredient will be haraam (unlawful) to consume.
Only Allah Ta’ala knows best
Ustadha Umm Abdullah
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
This answer was collected from DarulIftaBirmingham.co.uk, which is run under the supervision of Mufti Mohammed Tosir Miah from the United Kingdom.