On 10 Feb, 00:24, Colin Wilson wrote:
And when the OP finds some ammonia, let us know where you bought it
from. I went down this route some time ago, only to be told that it is
now a controlled substance.

ISTR it's only the clear ammonia that's restricted (it's a common
component in things that go boom), the cloudy stuff can't be used for
that I believe ?!?

It's a good idea in the current climate to keep *any* display of
knowledge of chemistry/physics to yourself.