Crackling Stars
#31
Posted 19 January 2004 - 04:44 PM
KNO3 - 50.0
Pine Charcoal - 6.9
Sulphur - 20.0
Atomized Aluminium -17.3
Fe2O3 - 5.8
Technically the mix was designed as a glitter mix. I used willow or Charcoal (can't remember) and used 300# Aluminium to get the effect of crackles.
It is noted that boric acid destroys the glitter effect so if you plan to get this wet (to make stars, for example) you will have to put some thought into it, Damned if i can't be bothered to do it for you.
Yes, there is a copper oxide mix.
Magnallium - 15
Copper(ii) oxide (black) - 10
Bismuth(iii) oxide - 75
Probably not what you were hoping for, but thats the only formula i can find that relates copper oxide to crackling stars, you might find that pure copper oxide is too reactive.
Steve
#32
Posted 20 January 2004 - 02:58 AM
-Matt
#33
Posted 27 January 2004 - 01:32 AM
Bismuth subnitrate__________70
Magnalium(50:50,-60 mesh___20
Copper(II) oxide____________10
Clive Jennings-White
#34
Posted 28 January 2004 - 10:40 AM
Not all, there is one based on lead dioxide and magnallium only.I think youll find that copper oxide is used in every crackling star compo. Seems to play anh important roll...
-Matt
#35
Posted 28 January 2004 - 11:10 AM
I know the one you mean. Lancaster posts Magnalium 11 and Lead Oxide 89. In reality, there are many formulation that do not require copper salts at all.Not all, there is one based on lead dioxide and magnallium only.
#36
Posted 28 January 2004 - 03:35 PM
Safety data for bismuth subnitrate
--------------------------------------------------------------------------------
General
Synonyms: bismuth nitrate basic
Molecular formula: Bi5O(OH)9 (NO3)4
CAS No: 1304-85-4
EC No:
Physical data
Appearance: dense microcrystalline powder
Melting point:
Boiling point:
Vapour density:
Vapour pressure:
Density (g cm-3): 4.93
Flash point:
Explosion limits:
Autoignition temperature:
Water solubility: negligible
Stability
Strong oxidizer - contact with combustible material may lead to fire. Incompatible with reducing agents, organic materials. Toxicology
Skin, eye and respiratory irritant.
Regards, Stay Green
Bear
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#37
Posted 29 January 2004 - 12:31 AM
No doubt there are endless varieties. I think that when it comes right down to it ease of manufacture and safety will always play the biggest parts.
#38
Posted 29 January 2004 - 08:22 AM
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#39
Posted 03 February 2004 - 04:08 AM
Aluminum Coarse: 30
Magnesium Coarse: 10
Flash Powder: 60
Dextrin +10%
#40
Posted 15 February 2004 - 11:55 AM
#41
Posted 20 February 2004 - 06:43 PM
My question is, they had red lead oxide(Pb304) their but it said that it had lead monoxide mixed in. Will this work in a dragon egg comp?
Edited by dfk, 21 February 2004 - 01:50 AM.
#42
Posted 21 February 2004 - 09:40 PM
Regards, Stay Green, BTW Where's everyone been, no new posts in 2 days?
Bear
Check Out My E-Bay Auctions !!
#43
Posted 21 February 2004 - 10:46 PM
Stuart
#44
Posted 22 February 2004 - 09:12 AM
Or possibly everyone is out chopping down small forests getting ready for an orgy of charcoal making in the summer months
and it is to dam chilly to be outside dancing around the ball mill while chanting to the BP spirits to let your BP be the best there is to be had.
Mark
BPA L1 & L2
#45
Posted 11 March 2004 - 11:44 PM
Mixing it was wild, I haven't done anything that exhilarating in a while.
Between dealing with its sensitivity and making sure none got on or in me the whole process took at least two hours.
I tried two comps, the first was definitely inferior
so I settled with this:
Pb304 70
Black CuO 12.5
Mg/Al 17.5
Al 200m(atom +5
The first batch I tried was screened and was rather week. After switching to the above comp I also switched to cutting. The end product was cubes that ranged from 2-4mm3.
When I lit one of these to test them, Ignition took a moment but when it finally went, this thing didn't crackle or pop, it exploded! does anyone know the chemistry of this comp?
I could tell by the red mark left in the middle of the blast burn and the equally loud pop from cubes half as small, that my bigger cubes weren't fully reacting(not sure of the right term)?
so I primed them my bigger cubes with this:
Micro star prime Best of AFN III
Kn03 57.4
c 11.4
s 11.4
Al(dark) 5.7
silicon 11.4
dextrin 2.9
I didn't have silicon but something I had been planing on trying was filings pulled from dirt with a magnet. Previously I tried these for spark effects but they only molted up and glowed for a while. this is the purpose silicon serves in this prime, so I thought id give it a go. Like I said I have never used silicon nor did I try plain meal but this worked fine for this purpose.
The primed eggs going off sounded more like a salute than anything else. After the prime burned up and stopped glowing the egg began to glow then BOOM!
I screened and granulated some of this comp and put some in my newly acquired glitter and pressed some comets. For my primed eggs, I rolled a few in some extra firefly comp I had, and plan to shoot them in a mine once dry.
This is some interesting stuff, so many applications.
When they dry, I will post results of crackling comets and exploding firefly stars.
Marcus
Edited by dfk, 12 March 2004 - 04:12 AM.
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