Any producer who produces 25 hectolitres of wine or more, is obliged to take all byproducts of the production process to an authorised wine distillery, such byproducts being:
- grape marc,
- must deposit (obtained at the primary clarification stage before fermentation),
- lees (obtained at the second clarification stage after fermentation).
This is an EU requirement governed by regulation (EU) No. 1308/2013 of 17 December 2013 and regulation (EC) No. 555/2008 of 27 June 2008.
Wine byproducts from all types of wine are subject to a qualitative objective that aims to avoid the over-pressing of marc and the excessive filtration of lees.
Producers who are subject to this regulation receive an SV8 form from Les Services de la Viticulture. This document indicates the quantity of pure alcohol to be produced.
The SV8 form must imperatively be sent to Distillerie Baron to regularise the producer's account.
All byproducts are collected from the estate:
- grape marc is collected during the harvest period,
- must deposit is collected as of the first settling and until the harvest declaration has been filed,
- lees are collected as of 26 November in a given year, up until 15 June of the following year.
In addition to the yield authorised for each appellation, producers may also declare:
- for white wine: between 1 and 10% of lees and must deposit,
- for red wine: between 1 to 5% of lees and must deposit.