The BBC show saw Fiona Bruce investigate a painting by William Nicholson belonging to guest Lyn in the episode aired this evening.
Viewers were gripped to see whether the painting, Glass Jug with Plates and Pears, was in fact genuine after it had been bought for £165,000.
There were some doubts along the way as Fiona visited a former forger, John Myatt, who had done one Nicholson forgery.
Fiona unveiled the painting to him, but although he said he had painted a jug on the one he did, it was not the one in this picture.
A handwriting expert was also on hand to offer some advice with after an in-depth analysis as he concluded it was 100 per cent authentic.
But as the narrator explained, handwriting alone would not be enough to prove its authenticity.
After pigments from Nicholson’s paintbox were matched to Lyn’s painting as well as a valid existing work of his, it was looking hopeful.
In fact, it was looking very positive for Lyn when at the end of the show Fiona announced what the final verdict was.
The result was given to the show by the leading authority on Nicholson, Patricia Reed via a letter.
But it wasn’t good news as Patricia said there was not sufficient evidence to validate the work of art.
Fiona struggled to find the words to comfort the woman as she said: “Lyn, I don’t know what to say.”
“I was expecting good news,” Lyn admitted to Fiona and art dealer Philip Mound.
Fiona then divulged her shock too as she said: “So was I.”
Lyn confessed her disappointment at the judgement but she made it known the feeling wouldn’t last forever as she said: “This too shall pass.”
It was clear Fiona was still reeling from the decision as she discussed the decision with Philip.
She exclaimed: “I’m shocked, I’m genuinely shocked by that verdict.
“I didn’t expect that, but ultimately it is down to Patricia Reed.”
Meanwhile, viewers were absolutely gobsmacked that the painting was written-off and took to Twitter to comment.
One viewer wrote: “Everything added up. Disappointing end. It’s a Nicholson. Feels like someone needs to admit they got it wrong. #fakeorfortune.”
“Just got fully invested in #fakeorfortune then, and now I’m fuming!” another exclaimed.
“So shocked at the verdict on #fakeorfortune I thought they’d cracked it – sad that it comes down to one person’s opinion in the end,” a third added.
Fake or Fortune continues Sunday at 9pm on BBC One.