Coronation Street star Jack P Shepherd had fans scratching their heads when he revealed a little-known nugget about Marmite.
The slogan is 'love it or hate it' and fans have now been challenged to 'hit it' after Corrie's David Platt dished out some startling information about the popular spread.
Jack revealed that the sticky dark brown yeast extract actually turns white when you hit it.
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"Yes. Get them spoons out," he encouraged fans on Twitter.
Jack revealed his Marmite fact on the podcast Sofa Cinema Club which he presents with Corrie co-stars Ben Price and Colson Smith.
On the podcast he explained to Ben and Colson: "I've got a fact about Marmite. If you smack Marmite with a spoon it turns white.
"You smack it once and it goes white?" asked Ben.
"No, no, no, no. Just keep smacking it," said Jack as he explained further.
"So it's black isnt it? and it goes dark brown to brown, to orange to like yellow to white, and I mean white like Tippex white.
"Do you know how? When oxygen gets into it."
The Sofa Cinema Club official Twitter asked with a 'screaming with fear' emoji: "Can someone please try this with @marmite and let us know if @jackpshepherd88 is telling the truth?"
"I mean, what made him smack it in the first place???!!!!" exclaimed one fan.
"I’m not buying a jar to find out but out of scientific curiosity I hope someone else carries out this experiment," said another.
And another follower, who took up the challenge, replied that it apears to be working.
"Well ours is still really light brown atm. Keep giving it a good 30 whacks every time I go in kitchen but it is getting there," they said.
Others responded to back up Jack's story.
"It does turn white. I've been doing it for years (as an avid Marmite fan), so yeah, @JackPShepherd88 is correct," said one.
"It’s true," confirmed another.
A scientist for the BBC previously tried it and said it was a 'fantastic effect.'
It was explained that as Marmite is so sticky, it has less opportunity to absorb light.
Whipping it introduces air-filled cavities and the more Marmite is stirred and the more bubbles are crammed in the whiter it looks.
Marmite, invented by German scientist Justus Freiherr von Liebig, is traditionally eaten spread thinly on toast.
It can also be made into a savoury hot drink by adding to a mug of hot water and is also commonly used in casseroles and stews.
This summer celebrity cook Nigella Lawson caused a stir when her recipe of the day was Marmite pasta.
"I must confess, I’m Italian and I love it! time to go buy some Marmite now," said one fan.
