“Never shall I forget the little faces of the children, whose bodies turned into wreaths of smoke beneath a silent blue sky” – Elie Wiesel, Holocaust survivor.

This week the world held Holocaust Memorial Day, marking 75 years since the liberation of Auschwitz by the Soviets. And to mark this anniversary, I have colourised a selection of photos taken throughout the first few months of 1945, as the rest of the world became fully aware of the horrors of the Nazi holocaust.

This was the most harrowing project I have ever worked on. I usually enjoy colourising photos as the process brings the subjects to life gradually, which is a satisfying experience. Still, with this project, it was upsetting as the images are so shocking.

They serve as a stark reminder of man’s inhumanity to man. I had to give myself time to do something else and try to switch off while working on these photos as they made me angry. I felt sicker as the pictures came to life, but I feel it was an important thing to do, to remind people – especially younger generations, that this happened and that it’s not that far back in history.

It is so important, especially as the years go on, that we do more to bring the past to life, and keep images like these relevant and shocking, so this never happens again.

The colourising process was also different as these people were close to death by the time of their liberation, so painting skin tones was utterly different. In colour, you can see the bones and the pale, bloodless skin, and even young men look older with greying hair and dark patches around their eyes.

I am a British photo colouriser. Please visit PhotograFix on social media like Facebook, Twitter, and Instagram if you want to check out more.

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The horror of the Holocaust in colour

Children at Auschwitz

Children at Auschwitz, in a still from the Soviet film of the liberation of Auschwitz, January 1945.

Starved men at Ebensee

This photo shows starved prisoners, nearly dead from hunger, posing in a concentration camp in Ebensee, Austria.

Ebensee was a sub-camp of the main camp ‘Mauthausen’ near the town of the same name. The camp was reputedly used for “scientific” experiments. It was liberated by the 80th Division of the U.S. Army.

Istvan Reiner

Istvan Reiner, aged 4, smiles for a studio portrait, shortly before being murdered at Auschwitz concentration camp.

Men at Lager Nordhausen

Two staring, emaciated men, liberated inmates of Lager Nordhausen, a Gestapo concentration camp. The camp had from 3,000 to 4,000 inmates. All were maltreated, beaten and starved.

An 18-year-old girl

An 18-year-old Russian girl during the liberation of Dachau concentration camp in 1945. Dachau was the first German concentration camp, opened in 1933.

More than 200,000 people were detained between 1933 and 1945, and 31,591 deaths were declared, most from disease, malnutrition, and suicide. Unlike Auschwitz, Dachau was not explicitly an extermination camp, but conditions were so horrific that hundreds died every week.

A living skeleton

This man looks like a living skeleton, one of the many prisoners of the Ebensee concentration camp in Austria.

Burning Bergen-Belsen

My Great Grandfather Charles Martin King Parsons took this photo as he was a chaplain with the British Army and he entered Bergen-Belsen prison camp in April 1945.

The camp was rife with typhus, and once the large wooden huts had been cleared of the surviving prisoners, they were burnt to the ground in May 1945.

Taken by C.M.K. Parsons

Like many people affected by the horrors they saw during the war, my Great Grandfather never really spoke about his experiences at Bergen-Belsen and these photos show why.

He also took a series of photos including the mass graves around Belsen which I did not want to colourise as it didn’t feel like the right thing to do. These photos can be seen here.

Woman at Bergen-Belsen

One of the victims at Bergen-Belsen was this young woman, her face still bearing the scars of a terrible beating by the SS guards.

Holocaust survivor

It is hard to find any hope when viewing the horrors of these photos, but I wanted to include this one, as there were survivors of the Holocaust, many of whom are still alive today.

This photo shows a young Jewish refugee, rescued from a concentration camp, resting up in a hospital bed in Malmö, southern Sweden in 1945.