内容摘要：Further talks involving Acas are due to take place in the coming days.

Further talks involving Acas are due to take place in the coming days.

She tested hundreds of books and then realised she was looking at a breakthrough."I realised there was a distinctive pattern to the toxic ones. It was a 'eureka' moment. I realised it was something that no one had seen before."

The next task was to speak to the physics department to build their own prototype.Dr Graham Bruce, senior research laboratory manager explains how it works."It shines light on the book and measures the amount of light which shines back," he says.

"It uses green light, which can be seen, and infrared, which can't be seen with our own eyes. The green light flashes when there are no fragments of arsenic present, the red light when there are pigments."The new testing device is smaller and will be less costly to produce and use than a full-scale spectrometer

It has already been used to survey the thousands of books in the St Andrews collections and in the National Library of Scotland, and the team hope to share their design with other institutions around the world.

"We're lucky as a large institution to have expensive kit, so that we can test 19th Century potentially toxic books," says Dr Jessica Burge, deputy director of library and museums at the University of St Andrews.Dr Harrhy, who runs a practice in Pontypool, Torfaen, said: "If we are always having patients into the practice who need lots of work done and they are not able to be put back into the central database, there is a saturation point and at which point, access into dental practices will cease.

"Our main concerns are we will have an overall reduction in the continuity of care... and we may find that dentists leave NHS dentistry which has been a trend over recent years anyway."Dentists also say the proposals offer no extra money to fund the changes.

But Miles said investment in dentistry had increased year on year."This isn't a contract we have drawn up from thin air, it is based on years worth of work, it's 13 months of negotiations with the BDA itself," he said.