c. 1750–1800 · Madeira
Madeira discovers what the voyage did to it
Wine that crossed the tropics twice came back better, and the island set about reproducing the effect deliberately.
What happened
Madeira sat on the Atlantic trade routes, and its wine was loaded as ballast and provisions on ships bound for the Americas, the Caribbean and the East Indies.
Wine that made the round trip, heated in the hold across the tropics for months, was found to be better than wine that had stayed on the island — softer, more complex, and extraordinarily stable.
Wine that had made the voyage was sold at a premium as vinho da roda, "wine of the round trip".
Reproducing the effect on land produced the two systems still used: estufagem, heating the wine in tanks for months, and canteiro, ageing casks in warm lofts for years, which is slower and generally produces better results.
The chemistry is deliberate cooked oxidation, and it is why an open bottle of Madeira keeps for months: there is nothing fresh left for air to spoil.
How firmly this is dated
Attested. Well attested, with the precise date or the attribution reconstructed rather than recorded at the time.
Shipper records and the subsequent development of the estufagem system. The observation that shipped wine improved is well attested; individual origin stories are not.
What this follows from, and leads to
A timeline is a list; these are the links between its entries.
Sources
Sources consulted
- Instituto do Vinho, do Bordado e do Artesanato da Madeira — IVBAM, Portugal
- The Oxford Companion to Wine — Oxford University Press
Along the timeline
Before · 1756
The Douro is demarcated
The Marquês de Pombal established a demarcated Port region with boundaries, classification and quality control.
After · c. 1750–1850
Port becomes a fortified wine
Adding brandy shifted from a preservative measure at shipping to a deliberate interruption of fermentation, which is what makes Port sweet.