18 replies to this topic

[nt8]

Name of composition: Melilac
Composition Type: nitrate/metallic color
Creator: nt8
Color/Effect: purple (but another people, another color perception)
The Composition:

 

Sr(NO3)2    24
CuO            22
KClO4         20
Parlon        18
MgAl           10
Redgum       6

Any Precautions/Incompatabilities: the Sr(NO3)2 must be anhydrous, hot prime needed

Precedure/Preparation: cut with aceton/parlon, pump or roll +5-7% dex. & water, add 6-8% Ti for tail

 

 

 

https://www.youtube....h?v=u8QXd0bhBWU

 

https://www.youtube....h?v=BzWehiAp2p0

 

with Ti

 

 

[Pirotex]

nt8, good color. Works with PVC?

[swapnilsutar1988]

Nice colour.
Thanks for sharing.

[nt8]

nt8, good color. Works with PVC?

yes, works and the redgum isn't necessary! In my 1st composition was sulfur, not redgum.

[rogeryermaw]

I made a pound of this comp last night. Thank you for sharing the composition. It looks awesome! Putting these in a 4 inch with a green strobe inner petal.

[nt8]

I made a pound of this comp last night. Thank you for sharing the composition. It looks awesome! Putting these in a 4 inch with a green strobe inner petal.

I am glad that you tried it!   I wait the 4" shell, the purple and the green is good combination, in my opinion (I have used often)

[ivars21]

Wow, that's a really nice and deep colour. What mesh MgAl? If you don't mind I added it to pyrodata database.

[nt8]

Wow, that's a really nice and deep colour. What mesh MgAl? If you don't mind I added it to pyrodata database.

I don't mind, i'm glad to you added my comp. to database
I think so, the database is very-very usefull. The pyrodata database - where are videos of  more compositions & where are new compositions - is necessary and important thing.

Most of compositions haven't videos in the internet, so we just imagine these based on the descriptions. if there is good quality video,  this is good, but the low quality video is better as the no video.

Edited by nt8, 09 February 2015 - 09:40 AM.

[Joshuam7]

Has anyone had a bad reaction with this composition? Followed the recipe for an 8 oz batch. After screen mixing i added 1 fl oz of acetone. Within a few minutes of hand mixing the comp got very warm started sizzling and let of noxious fumes.

[Mumbles]

Strange, I've only really heard of that happening with ammonium perchlorate based compositions.  Did you by any chance use magnesium instead of magnalium?  In any case, you may want to try to dry your acetone.  It's the root of the problem most likely. 

[SharkWhisperer]

Strange, I've only really heard of that happening with ammonium perchlorate based compositions.  Did you by any chance use magnesium instead of magnalium?  In any case, you may want to try to dry your acetone.  It's the root of the problem most likely. 

Super odd, for sure. Definitely impure or mistaken chems. Particularly because the starting formula offers the dextrin (5-7%) option, bound with water, of course.

 

Something's probably off with your chems. I've mixed all of those components together in variable ratios, and bound with both water and organic solvents, and never had this issue or any bad reaction, actually. Kinda boring, which is just fine by me.

 

Check your chems. And your sources. Mumbs mentioned water in your acetone, but this shouldn't be a major issue with this formulation since it can supposedly be dextrin bound. I'm thinking, in line with Mumble's query, that perhaps your MgAl is actually purely Mg? Or mostly Mg? Dunno. Just  seems really odd.

 

Nonetheless, do not make guesses with energetic mixtures--if it's heating up and acting weird, well, something's not right and you are likely at risk. Sort it out before continuing, please. Be careful.

[Joshuam7]

Strange, I've only really heard of that happening with ammonium perchlorate based compositions.  Did you by any chance use magnesium instead of magnalium?  In any case, you may want to try to dry your acetone.  It's the root of the problem most likely. 

It was mg/al 200-325 i used from pyro chemsource. I was also thinking the acetone. The can is nearly gone, and i do remember a time leaving it open for more than a few minutes. The composition still burns a pretty purple. I wasn't able to cut the stars like i intended (dried and hardened as soon as the reaction occured) but i have some nice crumble for festival ball shells.

Edited by Joshuam7, 16 January 2021 - 03:05 PM.

[Carbon796]

Sounds like a AP issue. Mislabeled, contaminated, or mistaken identity.

[SharkWhisperer]

Sounds like a AP issue. Mislabeled, contaminated, or mistaken identity.

"AP" as in ammonium perchlorate?

 

Hmmm? Cuz nobody's used it here--Mumbles mentioned similar unexpected comp heating experiences with AP-based comps, but nobody else has mentioned AP in this thread and the OP didn't use it, either. Strontium nitrate, CuO, and perc are the oxidizers mentioned having been used in current context.

[Carbon796]

You obviously missed the point about, mislabeled, contaminated, or mistaken identity.

Just because he didn't choose to use it. Doesn't necessarily mean it wasn't present.

Mumbles did not mention " unexpected " experiences.

This comp with its listed chems. And contaminated with, or subbed with AP. Is prone to react, when wet with water. Its common knowledge and well documented.

Edited by Carbon796, 17 January 2021 - 12:20 PM.

[SharkWhisperer]

You obviously missed the point about, mislabeled, contaminated, or mistaken identity.

Just because he didn't choose to use it. Doesn't necessarily mean it wasn't present.

Mumbles did not mention " unexpected " experiences.

This comp with its listed chems. And contaminated with, or subbed with AP. Is prone to react, when wet with water. Its common knowledge and well documented.

No don't think I missed the primary point. Actually, my first comment was "Super odd, for sure. Definitely impure or mistaken chems." Think that kinda goes along with your point. And one could also imagine multiple additional and equally likely scenarios to an "AP mixup" that could account for observations and comp heating. Just interesting that you pulled AP, and AP alone, out of your hat as a possibility.

[Carbon796]

I've made 10's maybe hundreds of pounds of comp. That contained those very same chems, plus others. Never once had a reaction, bound with water or denatured alcohol. But add some AP, with water present. And, it will be prone to react as described. The only other comp I've had heat up was a flitter/glitter type comp. But, that was only mildly so.

Edited by Carbon796, 18 January 2021 - 09:37 AM.

[Joshuam7]

I don't have any ap and i cut with acetone. All the chems i have are from fireworks cookbook and pyrochemsource. Have used them all in other comps, no issues. Still a mystery. One thought, i was mixing the comp at my kitchen sink in front of an open window (i live in northern PA and it's winter) outside isn't an option. A drop or 2 of water could have got in the comp from the faucet , although unlikely. My faucet doesn't leak andni wasn't mixing under it. Regardless, i used the stars in a few 1.75" shells and the worked great. Didn't even prime them, fearing another reaction with moisture. They all lit and were quite pretty.

[Carbon796]

The assumed source of water, would be from the acetone.

The combined combination of chems in that formula as written, are not overly reactive with water. That's why a few of us are suspecting, some type of contamination or mixup.

Edited by Carbon796, 20 January 2021 - 08:04 AM.