Jump to content


Photo
- - - - -

Sunrise yellow


  • Please log in to reply
79 replies to this topic

#21 Nessalco

Nessalco

    Pyrotechnician

  • Donator - HE
  • PipPipPipPip
  • 472 posts
  • Gender:Male
  • Location:Vermont
  • Interests:Pyro, high power hybrid rockets, local government

Posted 08 December 2015 - 02:22 PM

I just ordered some sodium nitrate. These stars are beautiful!

 

Kevin


There are two ways of exerting one's strength: one is pushing down, the other is pulling up. - Booker T. Washington
 

#22 gregh

gregh

    Pyrotechnician

  • Full Member
  • PipPipPipPip
  • 333 posts
  • Gender:Male
  • Location:Kentucky
  • Interests:Fireworks, Family, Fireworks, Classical Guitar, Did I mention I love fireworks?

Posted 08 December 2015 - 07:15 PM

Yeah, I tried to make them in June-July when it was mid 90's and humidity about that high... 



#23 pyrodoc

pyrodoc

    Pyromaniac

  • Full Member
  • PipPipPip
  • 140 posts
  • Gender:Male
  • Location:up in the sky
  • Interests:I love fireworks.

Posted 09 December 2015 - 08:10 PM

My sodium nitrate also absorbed moisture. I realised after making the stars when they were not lighting up. Cold and cloudy here in my city so will wait till summer now.

#24 Nessalco

Nessalco

    Pyrotechnician

  • Donator - HE
  • PipPipPipPip
  • 472 posts
  • Gender:Male
  • Location:Vermont
  • Interests:Pyro, high power hybrid rockets, local government

Posted 13 December 2015 - 11:57 AM

Got my sodium nitrate from Duda Diesel. I'm trying these as rolled stars. I've rolled a half kilo of cores from mustard seed, and another half kilo on top of some Yankie's purple cores. The comp rolls very easily using 50% alcohol. They are in the dry box right now, and they seem to be drying normally so far. If it ever snows I'll be testing them in shells.

 

Kevin


There are two ways of exerting one's strength: one is pushing down, the other is pulling up. - Booker T. Washington
 

#25 Stef727

Stef727

    Pyromaniac

  • Full Member
  • PipPipPip
  • 66 posts
  • Gender:Male
  • Location:Slovenia

Posted 13 December 2015 - 03:47 PM

So I just made the stars and dryed them at 50 C and like 15h after I turned the dry box off they were already wet...  You could feel the moisture in your hand and the stars break with just a hard press...

 

I'm going to dry them again and right after that put them in a double zip bag.



#26 lloyd

lloyd

    Firebreather

  • Donator
  • PipPipPipPipPip
  • 1,952 posts
  • Gender:Male

Posted 13 December 2015 - 03:52 PM

I'm just going to throw this in here, because I've been making yellows for decades, and have some 'definite opinions'.

 

One:  I just hate sodium yellows.  They look "sodium vapor amber" to me, no matter how well-executed.

Two:  I very much like tunable "optical" yellows that are made by blending red and green fires to get exactly the yellow shade you want.

Three: The red/green blends tend to be much less hygroscopic, if you use good-quality strontium compounds for the reds.

 

FWIW, four:  Our clients really (REALLY) like the optical yellows better than sodium yellows, four-to-one.

 

Lloyd


"Pyro for Fun and Profit for More Than Fifty Years"


#27 Nessalco

Nessalco

    Pyrotechnician

  • Donator - HE
  • PipPipPipPip
  • 472 posts
  • Gender:Male
  • Location:Vermont
  • Interests:Pyro, high power hybrid rockets, local government

Posted 13 December 2015 - 04:25 PM

I get that, Lloyd. I've never had the pleasure of playing around with the possibilities, and liked the effect on video. I've never (to my knowledge) seen sodium stars in person, so really have no basis for comparison. The yellows that I've made have tended to the lemon and in this case the amber tone of this star is part of the appeal.

 

What sealed the deal is that my spouse saw video of these stars and said "Oooh. You have to make that."    ;)

 

Kevin


Edited by Nessalco, 13 December 2015 - 04:28 PM.

There are two ways of exerting one's strength: one is pushing down, the other is pulling up. - Booker T. Washington
 

#28 lloyd

lloyd

    Firebreather

  • Donator
  • PipPipPipPipPip
  • 1,952 posts
  • Gender:Male

Posted 13 December 2015 - 04:30 PM

No matter HOW much you personally like or dislike an effect, the net result comes when you please the 'client' -- even if it's your wife! <G>

 

Lloyd


"Pyro for Fun and Profit for More Than Fifty Years"


#29 Nessalco

Nessalco

    Pyrotechnician

  • Donator - HE
  • PipPipPipPip
  • 472 posts
  • Gender:Male
  • Location:Vermont
  • Interests:Pyro, high power hybrid rockets, local government

Posted 14 December 2015 - 05:38 AM

My goodness these stars are bright! I lit a couple on the ground (too dry for star gun), and the spots in front of my eyes took forever to go away...

 

I tried two different grades of MgAl -  #-325 burns steadily, #80-200 gives a strobe-like effect, more pronounced as the size of the star increases - which may be an effect of the stars not being fully dry. I have no idea if the effect will persist when the stars are in motion.

 

Kevin


  • Ubehage likes this
There are two ways of exerting one's strength: one is pushing down, the other is pulling up. - Booker T. Washington
 

#30 Stef727

Stef727

    Pyromaniac

  • Full Member
  • PipPipPip
  • 66 posts
  • Gender:Male
  • Location:Slovenia

Posted 14 December 2015 - 09:05 AM

My goodness these stars are bright! I lit a couple on the ground (too dry for star gun), and the spots in front of my eyes took forever to go away...

 

Yep... This is exactly why I want THIS stars! still the hyrdoscopic part is annoying as sh*t...


Edited by Stef727, 14 December 2015 - 09:06 AM.

  • Ubehage likes this

#31 Nessalco

Nessalco

    Pyrotechnician

  • Donator - HE
  • PipPipPipPip
  • 472 posts
  • Gender:Male
  • Location:Vermont
  • Interests:Pyro, high power hybrid rockets, local government

Posted 14 December 2015 - 12:03 PM

I'm lucky to be working on these now because the humidity is so low - so far I've had no problems with moisture. My dry box uses a dehumidifier for both a heat source and water removal, right now holding 38C and 28% relative humidity. More concerns about static at these values, of course. In my work area the RH is about 45%, so there's a little less problem.

 

I want to build these into shells that I can store and not have the stars turn to a pile of goo. I'm thinking that if I apply a coat of polyurethane to the inside of the shell casing it would act as a pretty good moisture barrier.

 

Kevin


There are two ways of exerting one's strength: one is pushing down, the other is pulling up. - Booker T. Washington
 

#32 zan89

zan89

    Pyromaniac

  • Donator
  • PipPipPip
  • 96 posts
  • Gender:Male

Posted 15 December 2015 - 07:28 AM

When you finish them just put them in zip bag, until you put them in mortar.


  • Ubehage likes this

#33 Eric70

Eric70

    Pyromaniac

  • HE Qualified
  • PipPipPip
  • 90 posts
  • Gender:Male

Posted 15 December 2015 - 10:21 AM

Could also place them (stars or the shell) in a sealed container with dessicant packs.



#34 FlaMtnBkr

FlaMtnBkr

    Firebreather

  • HE Qualified
  • PipPipPipPipPip
  • 1,286 posts
  • Gender:Male
  • Location:Florida

Posted 15 December 2015 - 11:40 AM

I find zip lock type bags don't keep moisture out very well. I've had dried ammonium nitrate in 5 and 6 bag inside of bag and it still turns into a wet mess in about 6 months and only a couple days in one bag.
  • Voryon likes this

#35 lloyd

lloyd

    Firebreather

  • Donator
  • PipPipPipPipPip
  • 1,952 posts
  • Gender:Male

Posted 15 December 2015 - 11:52 AM

Yeah... LDPE bags breathe a lot more than one might think.

 

LLoyd


"Pyro for Fun and Profit for More Than Fifty Years"


#36 Nessalco

Nessalco

    Pyrotechnician

  • Donator - HE
  • PipPipPipPip
  • 472 posts
  • Gender:Male
  • Location:Vermont
  • Interests:Pyro, high power hybrid rockets, local government

Posted 15 December 2015 - 12:16 PM

I do use bags and desiccant crystals for storage, but as has been said, the bags allow a fair chunk of moisture through. I tend to be a 'belt-and-suspenders' kind of guy, so want something simple and reasonably foolproof. I coated the inside of some shell cases with polyurethane a few minutes ago. Seems a super-simple precaution - use enough to coat, not enough to soak through and affect the pasting. I used a paper towel to apply the varnish.

 

Kevin


There are two ways of exerting one's strength: one is pushing down, the other is pulling up. - Booker T. Washington
 

#37 zan89

zan89

    Pyromaniac

  • Donator
  • PipPipPip
  • 96 posts
  • Gender:Male

Posted 16 December 2015 - 05:23 AM

Yeah... LDPE bags breathe a lot more than one might think.

 

LLoyd

Didn't know that!



#38 Nessalco

Nessalco

    Pyrotechnician

  • Donator - HE
  • PipPipPipPip
  • 472 posts
  • Gender:Male
  • Location:Vermont
  • Interests:Pyro, high power hybrid rockets, local government

Posted 16 December 2015 - 12:18 PM

Okay - don't use polyurethane on the inside of ball shell cases. When dry the cases were severely distorted (egg shaped) and difficult to get the edges to mate and properly form into a sphere.

 

Kevin


There are two ways of exerting one's strength: one is pushing down, the other is pulling up. - Booker T. Washington
 

#39 lloyd

lloyd

    Firebreather

  • Donator
  • PipPipPipPipPip
  • 1,952 posts
  • Gender:Male

Posted 16 December 2015 - 12:28 PM

What would be the matter with coating them after they're pasted and dry?

L


"Pyro for Fun and Profit for More Than Fifty Years"


#40 Nessalco

Nessalco

    Pyrotechnician

  • Donator - HE
  • PipPipPipPip
  • 472 posts
  • Gender:Male
  • Location:Vermont
  • Interests:Pyro, high power hybrid rockets, local government

Posted 16 December 2015 - 02:40 PM

Doh!

 

Yeah, that should work. :blush:

 

Kevin


  • Ubehage likes this
There are two ways of exerting one's strength: one is pushing down, the other is pulling up. - Booker T. Washington
 




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users