Red Wine Colour Age: What Ullage Tells You

Reading red wine colour age cues starts with two things you can see through the glass. The first is the colour itself. The second is the ullage, which is the headspace in the bottle. Together they tell you about a wine's condition and its optimal drinking window. As red wine ages, its colour typically evolves from vibrant ruby or purple to more garnet, brick, or tawny hues. That visual cue often points to oxidation. Ullage, the space between the wine and the cork, is a key indicator of storage history and potential oxygen exposure. A lower fill level generally suggests greater oxygen exposure, which can accelerate aging and lead to faults. Auction houses and experienced buyers pay close attention to these factors, especially for mature vintages. The factors help determine a wine's quality and value. They offer clues about the wine's history before you open the bottle.

What does red wine colour tell you about its age?

The colour of your red wine can reveal insights into its age and condition. As red wine ages, it undergoes a transformation in its visual characteristics. Young red wines often display vibrant ruby or purple tones. Over time, these colours typically soften and shift towards more garnet, brick, or tawny shades. This change in red wine colour and age often tracks the wine's exposure to oxygen. Oxygen plays a role in its maturation. For specific examples of how colour evolves in mature wines, you can consult our mature Bordeaux and Burgundy colour by decade, tied to drink-window data.

How does ullage impact a wine's condition and value?

Ullage, defined by WineBid as "the space at the top of the wine bottle not occupied by wine," significantly impacts a wine's condition and resale value. This headspace is also known as the fill level. It is an important indicator of the care and storage conditions a wine has experienced. Wineries typically aim for an initial ullage level of between 0.2-0.4 inches (5-10mm) at bottling. Dirceu Vianna Junior MW gives 3-10mm in Decanter. Over time, wine is lost through cork absorption and evaporation. That causes the ullage to increase, Decanter reports.

A lower ullage level generally indicates potentially harmful levels of oxidation. Matt Walls, DWWA regional chair for Rhône, told Decanter about low fill levels. Walls said that "it suggests that air has been seeping into the bottle, which would cause the wine to oxidise." David Dudley-Jones of Dudley Jones Fine Wines added in Decanter magazine 2016 that "lower fill levels [in the bottle neck] and resultant seepage usually point to heat exposure and poor storage." WineBid notes that a low ullage "can indicate seepage and oxidation of the wine, and affect its value considerably." WineBid describes seepage as "The slow escape of wine due to natural cork lifecycle or storage conditions."

Auction houses and resellers of mature wines inspect ullage levels closely. The level helps them determine a wine's potential quality and value. Julia Sewell, sommelier at The Fat Duck, told Decanter that "ullage level can give you a few clues about your wine before you have the opportunity to open the bottle." However, Matt Walls cautions that it is "not a totally reliable measure of condition however; you do sometimes come across old bottles with a very low fill that have remained in good nick." Ultimately, Sewell notes that "the clues can only be confirmed once the wine is tasted, but it's certainly a help in anticipating the condition." For more detailed information on fill levels, explore our guide on wine ullage levels explained.

What are the standard ullage levels for different wine types?

Assessment of ullage levels differs by bottle shape, particularly for Bordeaux and Burgundy wines. WineBid both note that fill level descriptions vary with the distinct bottle shapes from these two regions. Michael Broadbent, a Master of Wine and former senior consultant of Christie's auction, developed a guide in the late 1980s. It covers the evaluation of ullage levels in matured wines, and it focuses primarily on Bordeaux. This guide has been "generally accepted and widely used in the wine market as an evaluation tool for all sorts of wine."

Here is a comparison of ullage terms for common bottle types:

Ullage Description (Bordeaux, Cabernet Sauvignon, and similar bottles, WineBid)	Age Implication (WineBid)
Base of neck or higher	A perfect fill level for any bottle of any age
Very top shoulder	An excellent fill level for any wine more than 20 years old
Top shoulder	Acceptable and normal for wines 15 years of age and older, and very good for wines 35 years of age and older
Mid shoulder	May be normal for a wine that is 40 years old or older
Low shoulder	Occurs in older wines