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It may look like an alien, but this unusual goo is simply a mixture of cornflour, water and food colouring captured in slow motion.

Gavin Free and Daniel Grunchy, who are known as the Slo Mo Guys on YouTube, filmed the mixture being agitated by a loud speaker to demonstrate its strange behaviour.

The red goo is the consistency of water – a liquid – but with the vibration of a speaker, it transforms into a solid and is an example of a non-Newtonian fluid.

Popular YouTubers Gavin Free and Daniel Grunchy, who are known as the Slo Mo Guys, filmed a mixture of cornflour and water being agitated by a loud speaker (pictured). The red goo is the consistency of water – a liquid – but with the vibration of a speaker, it transforms into a solid and is an example of a non-Newtonian fluid

In their experiment, they ripped the front off an old speaker and poured the red slime onto its cone body.

'One of the ways you can keep a non-Newtonian fluid constantly agitated is by pouring it in a speaker and watch it bounce around while affected by different frequencies of sound,' they told MailOnline.

The video experts used a high speed camera capable of recording 2,500 frames a second - 100 times slower than real life – to capture what happened.

As they turned the volume up, the vibrations from the speaker caused the non-Newtonian liquid goo to turn into a solid and create fascinating shapes.

When cornflour and water is mixed together (pictured), the large flour particles are suspended in the liquid. The slime is thick because the particles are packed close together, but are still able to slip past each other

In their experiment, the Slo Mo Guys ripped the front off an old speaker and poured the red slime onto its cone body (pictured) 'One of the ways you can keep a non Newtonian fluid constantly agitated is by pouring it in a speaker and watch it bounce around while affected by different frequencies of sound,' they told MailOnline

Sir Issac Newton described how 'normal' liquids behave, by saying they have a constant flow. The flow of water, for example, only changes in temperature or pressure.

But non-Newtonian fluids break his rule because they change their flow behaviour (viscosity) under stress.

For example, if you hit or shake the cornflour goo, as well as placing it on a speaker, the sudden application of stress causes it to get thicker and act like a solid.

When the source of stress is removed – and the speaker turned off, for example – the goo becomes liquid again.

This happens because when it is in its natural, unstressed state, the goo's particles are packed closely together but are still able to slide past each other, materials scientist Mark Miodownik told the BBC.

This means that when it is stirred slowly it behaves like a liquid.

But when the mixture is stressed - agitated by a speaker or hit with a hammer, for example - the water flows out of the mixture and the particles don't have enough time to move out of the way.

When the volume of the speaker was turned up, the vibrations caused the non-Newtonian liquid goo to turn into a solid and create fascinating shapes (pictured). This happens because water flows out of the mixture which separates and the particles don't have enough time to move out of the way. This means that the cornflour particles are packed close together so it acts like a solid

The Slo Mo Guys told MailOnline that they come up with the subject for their videos simply because they have an eye for what looks good in slow motion. They use a high speed camera capable of recording 2,500 frames a second - 100 times slower than real life - to capture everything from a speeding bullet to goo, in slow motion

This means that the cornflour particles are packed close together so it acts like a solid.

It is possible to hit a bowlful of the mixture – dubbed Oobleck by children's author Dr Seuss – with a hammer so that the particles lock together and the liquid becomes solid instead of splashing everywhere.

It can also be rolled into a solid ball, but if someone stops applying pressure, the goo will revert to liquid and ooze through their fingers.

The Slo Mo Guys told MailOnline that they come up with the subjects for their videos, which are viewed by over 4.5 million subscribers, simply because they have an eye for what looks good in slow motion.

'Our minds work in a different way. Plus we get suggestions in the YouTube comments section,' they said.

They use the most up-to-date high speed cameras that you can buy and film in HD.

'We have the Phantom Flex which can do 2500fps at 1080p and also a Phantom Flex 4k which will record 1000fps at 4k resolution. 

'In future it would be amazing to have a camera that would record in HD around the 100,000fps mark. That's the sort of speed where bullets become more than just a blur for a couple of frames,' they said.

'We'd like to spin a camera round looking inwards like a shot from the Matrix – using a motor, arm and a counterweight to give a 360 degree view.' The duo also said that they would like to capture something huge, like lightning, in slow motion. 

In the experiment, the cornflour goo makes interesting shapes when it is agitated by the vibrations from a speaker (pictured). The mixture has long fascinated scientists and was named Oobleck by children's author Dr Seuss. It also behaves strangely when hit with a hammer, blown with a straw and can be rolled into a ball