Aberdeen's historic Marischal College, the city council's new headquarters, is being transformed through restoration work.
Work is ongoing on the Category A-listed building to make it a new base for the local authority.
The face of the grey granite building has blackened over the years, but is now returning to its original look.
Almost half the cleaning work has now been completed, including the building's leopard heads.
Council leader John Stewart said: "The difference in the colour of the granite as the cleaning work progresses is really quite striking.
"It is hard to believe that what most of us know as an almost black building will soon be a light grey granite again, sparkling in the sun and once again reminding locals and visitors why Aberdeen is known as the Granite City."