It has taken hundreds of hours of painstaking restoration work but now an important Scottish painting's 'unreal' restoration can be revealed.

Thick, sooty dirt covered the front and back of artist William Barr’s portraits of Paisley's great and good, with water damage and layers of varnish adding to the challenge for conservators.

After 225 hours of careful conservation, new details of the oil painting are now in view - safeguarding an "extremely important" addition to the record of the town's history.

Curator of art at OneRen, Dr Victoria Irvine, says that it was "probably the most damaged" painting in Renfrewshire’s collection.

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When the restored painting returned, she said, it was an emotional experience.

She said: "When I saw it, I almost couldn’t believe it because it looked like a completely different painting.

"There was so much of the painting which had been covered and when it came back I was so surprised by the colour, the details and all the facial expressions that were lost underneath all those layers of soot, dirt and varnish.

"It’s an amazing job – the picture looking once more as the artist would have intended when it was first shown in 1911.

"It also gives William Barr the prominence as an artist that he truly deserves.”

In 1910, Barr, originally from Glasgow, completed pastel portraits of more than 100 of the town’s social elite: ministers, civil servants, councillors and industrialists.

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In a reflection of the Edwardian era, the completed work includes only four women – one of whom would later become the first chairwoman of Paisley Parish Council in 1912, the first woman elected to this rank of office.

The painting depicts figures in front of the Town Hall, a building which is also undergoing a multi-million pound complete restoration.

Dr Irvine said: "I remember this painting pre-conservation.

"The paint was literally coming off the canvas. The work that’s been done is unreal, it’s been so meticulous to stabilise the picture and bring it back to life.

"The picture itself is extremely important to Paisley and Renfrewshire’s heritage because it’s a particular moment in time; whenever we share these kinds of images, they really resonate because people connect with places and individual histories."

Both the painting and frame were worked on by a team of conservators - Gail Egan & Henry Matthews, conservator-directors of Egan, Matthews & Rose, assisted by student conservator Sophie Percival.

Ms Egan, whose firm is based in Dundee, described the condition of the painting.

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She said: “The painting was filthy, with thick, sooty dirt at the front and back, and the heavy plaster and silty deposits from the water damage at the reverse.

"As conservators, our main task is to ensure the stability of a painting and to preserve it in the best possible structural and visual condition for future generations, and we were excited to get started."

Mr Matthews said it was "immensely satisfying" to secure the future of the painting for generations to come.

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He added: "We were delighted with the overall appearance of the painting following the very complex structural and aesthetic treatment.

"It is immensely satisfying to have rectified the damage and stabilised the painting structure, ensuring that it will be safe and secure for the future.

"It was thrilling to reveal, through a challenging cleaning process, the true colours and detail of this lovely picture with all its local characters and charm.

"We are privileged and proud that we have been able to bring this important record of Paisley’s social history back to life."

Student conservator Sophie Percival said: "This was the first time I worked on a painting of this scale.

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"I was mostly involved at the retouching stage of treatment and with the treatment of the frame, which had suffered significant moisture and plaster damage.

"The frame treatment involved extensive reconstruction of lost and damaged mouldings, which was more complex than anything I had previously attempted, and I found I really enjoyed working on them.

"All of the expertise gained during the treatment of this complex project is a really valuable addition to my skillset.

"Large paintings no longer seem so daunting."

Paisley Museum, which is due to reopen next year, is currently being refurbished and will be operated by OneRen, Renfrewshire’s charity which provides cultural, community and leisure services.