Martin Brown wrote:

snipped
It is useless as a weedkiller compared to its much more reactive cousin
sodium chlorate (which degrades ulitmately to sodium chloride).
But unfortuantely it is banned within the European Union. And a very
useful item it was as well.
Peter

--
It is necessary for the good man to do nothing for evil to triumph.

Attributed to Edmund Burke 1729 - 1797