In order to preserve the quality of the Port wine, quality control has became the responsibility of the Institute of Port Wine (IVDP) since 1934.
The wines were no longer exported from the Douro valley and would be subject to tight control on the shores of Vila Nova de Gaia, which was an obligatory passage point.
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| An IVDP inspector checking C. da Silva Port wines at Vila Nova de Gaia |
All wines destined to the exporter´s warehouses, were inspected after leaving the "Rabelo" boat, (a traditional skiff used for the Port wine transportation).
In 1942 was created the seal of approval, as part of each bottle.
In 1942 was created the seal of approval, as part of each bottle.
IVDP´s lab was completely renovated in 1990 and in 1994 was certified by the Portuguese Institute of Quality. On average, annualy, 5000 samples are taken and about 130 000 analysis made. Analysis made to acidity, ph, reducing sugars, density, color characteristics, sulfur dioxide...
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