An "intense" piece of artwork by Charles Bronson which shows an inmate being tortured is being sold on eBay for £6,000
The disturbing sketch - drawn by the UK's most notorious prisoner - brings to life his depiction of an asylum.
His colourful illustration shows machinery being gouged into an inmate's eyes and parts of their limbs being torn off.
It comes as a Mirror poll so far suggests nearly 70 per cent of the public feel he should get his freedom after spending most of his adult life behind bars.
His prison stay is littered with rooftop protests, multiple hostage takings and violence against prison officers and other inmates, including attacking a fellow prisoner with a glass jug in 1975.
There was plenty of time for painting too and the artwork about to be sold was drawn in 1997 for a fellow inmate Freddy Archer at HMP Frankland.
The signed sketch - listed for £5,900 - also comes with a Certificate of Authenticity provided by Chaucer Auctions.
The description on the auction website reads: "Raw and Intense. As real as a Bronson gets.
"Note written on the back giving hope, words of wisdom and support as only Charlie can."
It comes as Bronson told his parole hearing earlier this week he spends 23 hours a day in his cell, a large part of it doing art.
Bronson, now known as Charles Salvador - after the artist Salvador Dali - claims it has raised thousands of pounds for charity.
The 70-year-old is the UK's most notorious prisoner having spent 48 years inside, with most of his time in solitary confinement.
In 1974, Bronson was jailed for aggravated burglary, assault with intent to rob and possession of a firearm at the age of 21 and sent to HM prison in Liverpool.
The original seven year sentence had been extended several times due to violent attacks on prison staff and fellow inmates - which he was convicted for in 1975, 1978 and 1985.
He was released in 1987 but found himself back behind bars 69 days later after robbing a jewellery shop.
Bronson was released again in 1992 but weeks later he was jailed for eight years for intent to rob - and has remained so ever since after a string of taking people hostage.
His parole hearing resumes today and is set to finish next Friday.
Dubbed one of Britain's most violent offenders, Bronson has been in prison for much of the last 50 years, spending the majority in solitary confinement or specialist units.
Bronson previously told how he was first sent to jail in 1968 and has held 11 hostages in nine different sieges - with victims including governors, doctors, staff and, on one occasion, his own solicitor.
Speaking during proceedings, Bronson revealed he was "born to have a rumble".
Giving evidence at the parole hearing, he explained he had a “beautiful childhood” but enjoyed the “excitement” he got from crime.
He added he behaves like a “gentleman” and plans to go and live in the country if released.
He said: “I just went wrong, I don’t know how, I don’t know why. I just enjoyed the excitement.”
Bronson made a number of bizarre comments during today's hearing, including that he is an "angel".
During his opening remarks he said: ""First of all, it's no secret I've had more porridge than Goldilocks and the three bears.
"I'm sick of it. I've had enough and I want to go home.
"You've got hundreds and hundreds of pages, statements, security, call it what you will, half of it is cr*p, absolute rubbish.
