内容摘要：The artwork will be displayed in a public exhibition at Sotheby's, in London, between 28 June and 1 July before it is auctioned with an estimated value of up to £300,000.

The artwork will be displayed in a public exhibition at Sotheby's, in London, between 28 June and 1 July before it is auctioned with an estimated value of up to £300,000.

"We are committed to preserving and celebrating this tradition for generations to come."More than 200 of London's gardens and galleries are free to attend this weekend as part of events to highlight the city's attractions.

London Open Gardens (LOG) 2025 is returning for its 26th year with visitors able to see up close the lesser-seen private spaces around the capital including an RHS Chelsea Flower Show winner and Tudor courtyards.Run by the charity London Parks and Gardens, this year's event will see more than 100 gardens open including five that are new to the scheme while Marlborough House is returning for the first time since 2017.Moving indoors, London Gallery Weekend (LGW) is back for its fifth year with 125 open for art lovers to discover London's creative communities.

London Parks and Gardens interim director Tim Webb said: "Protecting these green areas from harmful development will protect us from the worst impacts of climate change, adding greater value to our lives."He added that last year 93% of visitors said the event "reinforced their enjoyment of nature and appreciation of London's horticultural heritage".

Some of the gardens open this year include:

Of LGW, organisers say the event is the world's largest of its kind and "unique among global gallery events".Dr Gil took a practical approach to surveying the thousands of historic books in their collection.

"The most important thing was to find a non-destructive, portable instrument that could tell us if it was a poisonous book or not," she says.She rule out X-ray technology because of the fragile nature of the books being examined and instead looked to the geology department.

They had a spectrometer - a device that measures the distribution of different wavelengths of light - for detecting minerals in rocks."Minerals and pigments are very similar," says Dr Gil, "so I borrowed the instrument and started looking for emerald green in books."