Never waste another drop! New tool lets drinkers blow on the top of a Bailey’s bottle to find out how much is left

Baileys fans will no longer need to guess how much is left in the big black bottle.

Rather than peering inside or guessing by the weight, drinkers can now simply blow on the top.

The liqueur brand has designed an online tool that will listen to phone recording and calculate the volume left inside.

Called SoundScales, it will also suggest cocktail recipes and servings suitable for the amount of liquid left.

First launched in 1974, the signature black bottle design is not just a marketing ploy – it is designed to shelter the liquid from excess light.

Baileys claims its Irish cream can remain on the shelf for two years without losing its taste, even if its opened.

The online tool is similar in principle to how pan pipes work, with a deeper note indicating there is more air inside the bottle and therefore relatively empty. A higher pitch suggests the opposite.

The science behind it is fairly simple – the more space there is in the bottle, the slower the air molecules will vibrate.

Drinkers just need to record themselves blowing on the neck and note down whether it is a a 700ml bottle or one litre.

First developed in 1971, Baileys is the result of mixing Irish whiskey from the Gilbeys of Ireland distillery and surplus cream from Express Dairies, both owned by the same company.

It was the first Irish cream on the market when it was launched three years later.

Plumbers have previously warned boozers not to pour any leftover or unwanted Baileys down the drain.

The thick, creamy consistency can wreak havoc by clogging up the U-bend and stop other liquid passing through.

The liqueur brand has designed an online tool that will listen to phone recording and calculate the volume left inside