First created in the early 1960's, R.D. is the outcome of research developed by the House of Bollinger on the ageing of champagne on its lees. Not only does the wine retain its freshness but, through the extra contact with the lees, develops more complexity and subtlety. Remaining for a minimum of eight years on its lees, the R.D. acquires a greater aromatic complexity and length. On the other hand, the recent disgorging - the date of disgorging is inscribed on the back label - gives the wine an exceptional freshness.