On 26/02/2018 20:12, Chris Hogg wrote:
On Mon, 26 Feb 2018 19:09:21 +0000, Martin Brown
wrote:

On 26/02/2018 17:07, Huge wrote:
On 2018-02-26, Martin Brown wrote:

[26 lines snipped]

Drilling it with the largest long drill bit you can find and loading the
holes with dry potassium nitrate

Good luck buying that these days.

It should be in most garden centres as fertiliser.

Hmm... I don't recall ever seeing it pure, certainly not recently,

I haven't looked all that recently but it is usually next to ammonium,
ferrous and magnesium sulphate. Along with other specialist feeds.

mostly it's compounded with other NPK elements into a general
fertiliser.

Or Amazon:

https://www.amazon.co.uk/Potassium-n.../dp/B0166MYGGE

You have to grind it (and all the other components) very fine to make
gunpowder. By comparison sodium chlorate was trivial to make a bang.

Pyrotechnics are very unforgiving - as one expert once told me "all the
best fireworks makers in the world are missing precisely one finger".

That does surprise me, bearing in mind it's a major ingredient in an
easily-made explosive often used in quarry blasting.

I think you are thinking of ammonium nitrate. That is a bit harder to
get for home users but there are big sacks of it sat around on farms.
One of the big brands is my name backwards Nitram.

https://www.cffertilisers.co.uk/fert...trogen/nitram/

--
Regards,
Martin Brown