On 07/07/2015 18:11, Christina Websell wrote:
I'm not sure what "synthetic dust" could be present in my house to make the
vacuum cleaner fluff dangerous to compost. What*is* synthetic dust? I
want to know too.

Dust made up of fine particles of synthetic materials

But I think Janet's comment was around the use of 'synthetical' - which
probably resulted from the fact that Michael's first language (and
prtobably second) isn't English. However, he does speak it (well, write
it - I haven't heard him speak) better than a significant number of
native English speakers I've come across.

--
regards andy