Age indications, single vintage, minimum component age and average/style age must not be conflated. Statements about unfiltered LBV ageing, reserves, tawny composition, dates and legal limits remain unverified secondary claims. The approximate fortification calculation is illustrative, not a user trial recipe. September 28 audit: IVDP distinguishes optional Bottle Matured LBV (at least three years in bottle) from a universal rule for all unfiltered LBV, and recognizes Ruby, Tawny and White Reserve categories. Age indications in these wine categories cannot be transferred to whiskey age statements. https://www.ivdp.pt/pt/comunicacao/guias-tematicos/enologia-e-praticas-enologicas/guia-enologia-e-praticas-enologicas/capitulo-1-definicoes/

Full-source second-edition wine/blind-tasting review; supplied PDF positions, not printed pagination.

The source connects Anglo-Portuguese trade, demarcation and river transport with Douro production, then distinguishes ruby/reserve, LBV, vintage/single-quinta/crusted, tawny/colheita/garrafeira and white/rose port. It describes both blended lots and single-vintage bottlings, and different balances of cask and bottle maturation.

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Port combines fortification history, terroir selection and several ageing paths

Paraphrase checked against the supplied text and rendered page images. Verified means source fidelity, not independent validation of every claim or applicability to whiskey.