On 5 Mar, 00:08, Andy Dingley wrote:
On 4 Mar, 18:28, JimK wrote:

Anyhow (fellow scientist :), how do you know you were looking at the
actuall "killer" fibres themselves?....

because the family business spent 20 years hauling the stuff around
(fireproof flooring and panelling) and I know what the fibres look
like under a microscope. I have 2000 sq ft of asbestos cement roofing
board (20 years old and 50+ years old) above the sheds, and it's best
not to ask what I've got squirrelled away inside them, but I can tell
you that I'm not worried about it catching alight...

that must be some microscope?!

JimK