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#16 Creepin_pyro

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Posted 24 September 2008 - 09:22 AM

that's not accurate... you can make some good green, red, purple


Are these actually good/useable though?

I've heard mention of kno3 colour formulas but have never seen any, apart from a few in Weingart which are useless.

#17 Bonny

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Posted 24 September 2008 - 02:08 PM

that's not accurate... you can make some good green, red, purple


I've never seen any formulas that I would consider "good" colours using ONLY KNO3 as the oxidizer...care to share them?


Indeed. I have seen good pink, red, yellow and green compositions with just KNO3 (yellow based on chloride, red based on carbnoate, green based on a little bit of bano3, kno3, carbonate and a chlorine donor).


I was mainly referring to red and green... yellow and pink (likely a washed out red) would be easy. In the case of the green you mention needing Ba(NO3)2, where demoman was asking for formulas using ONLY KNO3 as the oxidizer. I tried many formulas over the last few years and was not happy with any REDS using KNO3 or GREENS without Ba(NO3)2.

#18 pyrotrev

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Posted 24 September 2008 - 10:35 PM

I just happened to be reading some papers by Shimizu in which he listed some nitrate based colour mixes which sound interesting - I've not tried any of them myself, but here they are in case anyone is interested:

Green Nitrate

KNO3 30
BaCo3 20
Mg 40
PVC 10

Red Nitrate

KNO3 20
SrCO3 10
Mg 60
PVC 10
The papers state that with strontium the chlorine donor doesn't strengthen the red light spectral bands, but rather serves to decrease the background spectrum to give a purer colour. It looks a bit under-oxidised to me, but then I don't pretend to know as much about flame chemistry as Dr Shimizu!

Edited by pyrotrev, 24 September 2008 - 10:50 PM.

Trying to do something very beautiful but very dangerous very safely....

#19 Mumbles

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Posted 25 September 2008 - 05:40 PM

With all that Mg in there, it can use the carbonates as oxidisers too. I agree though, the red does look mighty underfueled.

I want to say I saw a very old nitrate based blue. I will see if I can find it. As I recall it was a mixture of about every poisonous chemical known to man. A bit of Potassium Nitrate, Paris Green, Calomel. Might as well toss in some Realgar, ricin, and a pure culture of smallpox while we're at it.




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