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Port
Port  
Hello,

I have found a box of Port miniatures from the 90's and attach a picture.  

The Port appears to have 'spilt' and I have never seen this before, do I
Take it as they are screw caps the Port has spoiled or can this happen
With age and the port be OK to drink.

Many thanks in advance

Lee

Answer
That is a very common occurrence. What happened was that tannins and anthocyanins (compounds responsible for wine colour and taste) bound together until they finally grew up so much they became insoluble in wine and deposited. This happens particularly when there is oxygen present. These miniature bottles' screwcaps are not tight enough to prevent air from getting in, so oxygen from air got in the wine and caused that phenomenon. There is no harm in drinking the wine, if you want, it just won't taste as it did before. The colour will have changed to brown or orange too.

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Antonio Rocha Graša

Expertise

Viticulture issues, enology / winemaking issues. Wine regions of the world, with specialisation in the wines of Portugal, including Port. Tasting and sensory analysis, chemical analysis and the relation between both. Wine industry and wine economics (BUT NOT PRICES OF WINES). Sources of information regarding any aspect of wine. The human element of the wine industry and the integration of all aspects and sciences that concur to make a wine. Terroir.

Experience

I have been a winemaker for 20 years. I am also in charge of the R&D department of the largest wine company in Portugal.

Organizations
Sogrape Vinhos S.A. ADVID (Association for the Development of Viticulture in Douro)

Education/Credentials
Degree in Enology - UTAD, Vila Real, Portugal

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