Ask for rum in Carriacou and there is a fair chance you will be handed Jack Iron. The name belongs to a 69% white rum bottled by Westerhall Estate in Grenada, but on the sister island it is used more loosely for strong white rum in general. It is the drink at wakes, weddings, Big Drum dances and boat launchings, and visitors usually meet it through its party trick: drop an ice cube in a glass and it sinks.
This piece explains what Jack Iron is, why the ice behaves that way, how the rum fits into Carriacou's customs, how locals drink it and what to know before you buy a bottle to take home.
What Jack Iron actually is
Jack Iron is a white overproof rum produced by Westerhall Estate in St David's, Grenada, and bottled at 69% alcohol by volume, or 138 proof. It is a molasses-based, column-distilled rum, clear and fiery, with little of the sweetness people associate with aged or spiced rums. Westerhall's bottles describe it as blended and bottled at the estate, which no longer distils on site.
In Carriacou and Petite Martinique the term stretches beyond the brand. Older people may call any strong white rum "jack iron", and over the years other high-strength rums have circulated on the islands, some arriving by sea from neighbouring countries. When someone offers you jack iron at a gathering, the bottle on the table may not be Westerhall's at all. The common thread is strength: this is rum meant to be taken in small measures.
Where the name came from is less certain than people sometimes claim. Explanations offered locally range from a reference to the rum's iron-hard kick to older trade and sailing slang, and none is well documented. What is clear is that, in Carriacou, overproof white rum has been part of hospitality and ritual for generations, long before any single brand became associated with it. Westerhall's bottle simply gave that tradition a familiar name and a consistent strength, and today it is the bottle most visitors see on shop shelves in Hillsborough.
Why ice sinks in Jack Iron
Ice floats in water because it is less dense: about 0.92 grams per cubic centimetre against 1.0 for liquid water. Ethanol is much lighter than water, at about 0.79, so the more alcohol a drink contains, the lighter the liquid becomes. At around 69% alcohol by volume, a water and ethanol mixture is roughly 0.89, which is lighter than ice. The cube therefore drops to the bottom of the glass rather than bobbing on top.
It is a real effect, not a myth, and it works with other spirits of similar strength, including Clarke's Court Pure White and Rivers. As the ice melts it dilutes the rum around it, and the mixture eventually becomes dense enough for smaller pieces to rise, which is part of the fun of watching it. Temperature plays a part too: the colder the rum, the denser it is, so the effect is clearest with rum at room temperature and a solid, freshly frozen cube. The demonstration is a good reminder of something more practical: if ice sinks, the drink in front of you is roughly three times the strength of an ordinary bottle of gin or whisky.
Jack Iron in Carriacou's customs
Big Drum and the ancestors. Carriacou's Big Drum, or Nation Dance, honours African ancestral nations, and rum is part of the ritual. A little is poured on the ground before the drumming and dancing begin, as an offering to those who came before. Visitors attending a Big Drum should follow the lead of the hosts.
Boat launchings at Windward. Carriacou's boatbuilders, especially around Windward, have long launched their wooden sloops with ceremony: prayers, music, food and rum, some of it splashed on the hull. A launch is a community event, and a bottle of rum is a welcome contribution if you are invited.
Maroons and saraca. Community feasts known as maroons, and the saraca offerings of food to the ancestors, are often accompanied by drumming, dancing and rum. They are tied to the agricultural calendar and to family occasions.
Regatta, wakes and weddings. The Carriacou Regatta, held around the August holiday weekend, brings boat racing and plenty of celebration. At wakes and weddings, rum is part of the hospitality, poured for guests as a sign of respect.
How to drink it without regretting it
Local drinkers handle Jack Iron with practised caution, and it pays to copy them.
- Small measures only. A shot in Carriacou is small for a reason. Take it in one mouthful rather than sipping.
- Use the chaser. A glass of water alongside is standard; take the rum, then the water.
- Mix it if you prefer. Coconut water, fruit juice, ginger ale and soft drinks are all common partners, and the rum still carries through.
- Eat first. Overproof rum on an empty stomach in the heat hits hard and fast.
- Watch the boat trip. Many Carriacou outings involve water taxis to Sandy Island or Paradise Beach. Swimming and snorkelling after strong rum is a genuine risk.
- Know your round. At a gathering, accepting a drink usually means you join the pouring; offer the bottle back when it is your turn.
Buying a bottle and getting it home
Jack Iron is sold in supermarkets, liquor stores and rum shops across Grenada, Carriacou and Petite Martinique, usually in full-size and smaller bottles. Prices are modest by international standards, and you can often find it cheaper in a supermarket than at an airport shop. In Carriacou, shops in Hillsborough and around Tyrrel Bay keep it in stock, though supplies arrive by sea and a particular size can sell out.
At 69%, Jack Iron sits just under the 70% limit airlines apply to spirits, so it can go in checked luggage in an unopened retail bottle. It cannot go through security in hand luggage unless bought in the airport's departure area and sealed in a tamper-evident bag. Check your home country's customs allowance too: most limit duty-free spirits to one litre or a few litres per adult. If you were offered home-bottled rum of unknown strength at a gathering, do not pack it, because you cannot show that it is under 70%.
When to visit Carriacou for its rum culture
Rum is part of daily life in Carriacou all year, but some dates bring it to the surface. The Carriacou Regatta Festival, built around boat races and held around the early-August holiday weekend, fills Hillsborough and Tyrrel Bay with sailors, visitors and returning islanders. Spring brings the Carriacou Maroon and String Band Music Festival, usually in late April, which showcases Big Drum, string bands and the maroon tradition. December has the Parang Festival, with its seasonal string music. Exact dates shift from year to year, so confirm with the Grenada Tourism Authority before booking.
Carriacou is reached by the inter-island ferry from the Carenage in St George's, a crossing of roughly two hours depending on the boat and the sea, or by a short domestic flight to Lauriston Airport. Accommodation is limited and fills fast around Regatta. The island was badly damaged by Hurricane Beryl in July 2024, and although much has reopened, some businesses are still rebuilding, so ask your guesthouse what is operating. Visiting during a festival is the easiest way to see the customs described here, but always treat Big Drum and maroons as community ceremonies first and performances second.
Frequently asked questions
How strong is Jack Iron rum?
Westerhall's Jack Iron is bottled at 69% alcohol by volume, which is 138 proof. That is roughly twice the strength of a standard rum at 40% and just under the 70% limit airlines set for carrying spirits. Locally the name is sometimes used for other overproof rums too.
Does ice really sink in Jack Iron?
Yes. At about 69% alcohol the liquid is less dense than ice, so a cube drops to the bottom of the glass. As it melts and dilutes the rum around it, smaller pieces may later rise. The same happens in other spirits of similar strength.
Is Jack Iron made in Carriacou?
No. The Jack Iron brand is bottled by Westerhall Estate on mainland Grenada. Carriacou is where it is most strongly associated with local culture, through Big Drum, boat launchings, Regatta and family occasions, and where the name is often used for strong white rum in general.
Can you take Jack Iron home on a plane?
Yes, in checked luggage in an unopened retail bottle, because it is under 70% alcohol. Airlines and US rules limit spirits between 24% and 70% to five litres per passenger. It can only travel in hand luggage if bought after security and sealed in a tamper-evident bag.
What do people mix Jack Iron with?
Many drink it neat in a small shot with a water chaser. Popular mixers include coconut water, fruit juices, ginger ale and soft drinks. It also turns up in home-made rum punch, which is one reason a punch at a Carriacou gathering can be much stronger than it tastes.
