Yankie Posted August 29, 2008 Share Posted August 29, 2008 (edited) Name: Yankie’s flash starsComposition type: special effect starCreator: YankieEffect: These stars glow orange for a short time before erupting in a bright white ball of light, similar to a camera flash. The larger the star is, the more strobe-like it becomes. These stars are great for those with limited access to chemicals as it uses only the most basic ingredients. Composition:KNO3: 40Aluminum (300 mesh, atomized): 20Sulfur: 10Dextrin: 5Boric acid: 1 Method, Ball mill all the ingredients except the aluminum for no more then 5 minutes, it may ruin the effect if it is milled longer. Screen the aluminium into the mix using the screen method until the mixture is homogeneous. Now wet the composition with water:alcohol (75:25) (methylated spirits works). The stars can be pumped or cut, but must be bigger than 4mm as they may not work if they are smaller. Cutting the stars is easiest as you can paint a black powder slurry on the top of the slab before breaking it apart, thus only priming one side and allowing a longer delay. If you prime them on all sides the delay is reduced. Priming is not 100% necessary. Summary, 4mm stars tend to flash 1 or 2 times, 8mm stars will flash 3-4 times and the bigger the stars get the more flashes and more rapidly they will flash. Heres a video of a 4mm pumped star on the ground: http://www.youtube.com/watch?v=Tf1qYL2Xt1cHere is several 4mm stars in a 2” shell: http://uk.youtube.com/watch?v=duV42UxNV7UAnd some 8mm stars in a 2” TT shell: http://uk.youtube.com/watch?v=RQl3iNOSxvU Edited December 10, 2008 by TheSidewinder User-requested update of information Link to comment Share on other sites More sharing options...
Gunzway Posted August 29, 2008 Share Posted August 29, 2008 I got to say, if these have a the same results in the air they will be great for star mines etc. The best thing about it is, the easiness of making them + the fact that most people have these chemicals. That way people which don't have access to KClO4 etc can have a good effect with just basic chemicals.Thanks for this fredbert, tomorrow I'll be making a batch and doing a few observations and see what they work good in. Cheers, Link to comment Share on other sites More sharing options...
crazyboy25 Posted August 29, 2008 Share Posted August 29, 2008 Cool effect but microstars are well...micro. I doubt the effect will work with larger stars could you please try it make a pumped cut or rolled star about 1/2" diameter with this comp and see if it preforms the same? Link to comment Share on other sites More sharing options...
flying fish Posted August 30, 2008 Share Posted August 30, 2008 (edited) I will definetely give this a try. What do you prime them with? I managed to get myself some silicon, but I wonder if the fence post prime might be overkill, or may even destroy the delay effect. After all, isn't the delay probably caused by the fact that the mixture has to build up to the ignition temperature of the aluminum? Edited August 30, 2008 by flying fish Link to comment Share on other sites More sharing options...
crazyboy25 Posted August 30, 2008 Share Posted August 30, 2008 I think hot prime would destroy it. I have seen a similar effect when lighting small piles of copper oxide thermite. It glows brightly then puffs. Link to comment Share on other sites More sharing options...
Yankie Posted August 30, 2008 Author Share Posted August 30, 2008 quote: "I will definetely give this a try. What do you prime them with?" They can simply be primed with bp, I just rolled them in meal powder and they light really easily, I doubt they even need a prime. quote: "Cool effect but microstars are well...micro. I doubt the effect will work with larger stars could you please try it make a pumped cut or rolled star about 1/2" diameter with this comp and see if it preforms the same?" I have made some larger ones however they are not totally dry, but from what I can see the effect is rather poor, sometimes it doesnt work at all. when I throw them in the fireplace however they are strobe-like. I will test them when theyre dry on monday. Link to comment Share on other sites More sharing options...
Yankie Posted September 1, 2008 Author Share Posted September 1, 2008 (edited) My 60 gram batch of the cores is a dud took me hours to press them allI think I may have milled the mix too long, as the first ones I only used a mortar and pestle.I tested the large ones and the small ones, the large ones looked pretty good, and even though the small ones didn't work it looked pretty cool with the raining orange dots. Not quite sure how to attatch video yet. flashy_flashy_stars.wmv Edited September 1, 2008 by fredbert Link to comment Share on other sites More sharing options...
yellowcard Posted September 1, 2008 Share Posted September 1, 2008 Seems like a cool star. Do you think this wil also work with 250mesh atomized aluminium ? Link to comment Share on other sites More sharing options...
Yankie Posted September 1, 2008 Author Share Posted September 1, 2008 Seems like a cool star. Do you think this wil also work with 250mesh atomized aluminium ? I am not sure, but I would think so, you will have to test it. Link to comment Share on other sites More sharing options...
mike_au Posted September 2, 2008 Share Posted September 2, 2008 I pumped a couple of dozen of these yesterday, I tried one this morning and there was no delay it went up instantly with a bright flash :/ Was the one in your first video primed? I primed with meal, I'm wondering if it got too hot too quick. Even if I can't make them work like yours, they would make nice cores for charcoal stars. Link to comment Share on other sites More sharing options...
starlight Posted September 2, 2008 Share Posted September 2, 2008 fredbert should try to lower the percentage of dextrin, try 4% Link to comment Share on other sites More sharing options...
Yankie Posted September 2, 2008 Author Share Posted September 2, 2008 Was the one in your first video primed? I primed with meal, I'm wondering if it got too hot too quick. I did not prime them, I have made a few dozen today and am waiting for them to dry. I think they need to be milled for a minimum like D1. fredbert should try to lower the percentage of dextrin, try 4%I like my stars rock hard, you can try with less dextrin but theres a slight possibility that it could alter the effect. Link to comment Share on other sites More sharing options...
Yankie Posted September 4, 2008 Author Share Posted September 4, 2008 I have tested these in a 2" shell with some D1 stars and may I say they look terrific. http://www.youtube.com/watch?v=duV42UxNV7U Link to comment Share on other sites More sharing options...
Spider Posted October 7, 2008 Share Posted October 7, 2008 I'm quite impressed, very nice effect and a simple formula. great!I made a small batch of about 30g today with dark alu. the next smallest aluminium I have is 63µ (about 230mesh), I doubt this will work, but we'll see:D I hope rolling works as good as pumping does, if someone wants to know, I can tell more tomorrow:) greetings! Link to comment Share on other sites More sharing options...
Miech Posted October 7, 2008 Share Posted October 7, 2008 Make sure it is atomized spherical aluminium you are using, flake aluminium will probably give you a sort of silver streamer stars. Link to comment Share on other sites More sharing options...
swervedriver Posted December 29, 2008 Share Posted December 29, 2008 (edited) I made some of these today and quick dried in the sun, 4mm pumped using a 1cc syring. I used 400 mesh Al in a small 80g batch to test. I forgot to add boric acid, but a ground test worked anyway. The effect is just as described. 2-3 super bright strobing flashes after approx 2 second glowing delay on the ground. I rolled them in tigertail. Man, that TT comp was hard to roll for me, maybe because it was a small batch, those are some super ugly stars. They look like black raspberries. Oh well, hopefully i didn't mess the Al in the Flash Star comp up by putting the TT and additional water over them. We'll see. Anyhow, this composition works! Thanks! edit: oh forgot to mention, I ball milled it for an hour and a half too. I've since quick dried some flash star cores with the tigertail comp rolled on them, they work great. Shell buildin' time! Edited December 29, 2008 by swervedriver Link to comment Share on other sites More sharing options...
Yankie Posted December 30, 2008 Author Share Posted December 30, 2008 edit: oh forgot to mention, I ball milled it for an hour and a half too. I've since quick dried some flash star cores with the tigertail comp rolled on them, they work great. Shell buildin' time! Well that is pleasing to hear, I said the comp cant be milled too long as after I made a batch that was well milled it none of them worked. Maybe the stars were too small, or I left a chemical out. Link to comment Share on other sites More sharing options...
swervedriver Posted December 30, 2008 Share Posted December 30, 2008 Well that is pleasing to hear, I said the comp cant be milled too long as after I made a batch that was well milled it none of them worked. Maybe the stars were too small, or I left a chemical out. I found that the flash stars have to be really dry to get the flash. Mine would light, then glow, then just go out if not bone dry. Maybe that could be why? Link to comment Share on other sites More sharing options...
droppin88 Posted January 14, 2009 Share Posted January 14, 2009 what if I didnt have boric acid? whats the difference if I did or did not? Link to comment Share on other sites More sharing options...
WarezWally Posted January 14, 2009 Share Posted January 14, 2009 Boric acid is used to stop the aluminium reacting when wet, its not strictly required. Link to comment Share on other sites More sharing options...
50AE Posted January 18, 2009 Share Posted January 18, 2009 I tried this composition, 3/8 cut star size, very nice. They light easily, primed with BP. The Al I used was -400 atomized. Link to comment Share on other sites More sharing options...
slartibartfast42 Posted February 2, 2009 Share Posted February 2, 2009 I must say for such a simple forumula and common ingredients i am very impressed, both lively and pretty. this is a great additions to my collection of formulas. Thanks Mark Link to comment Share on other sites More sharing options...
Steps Posted February 2, 2009 Share Posted February 2, 2009 Out of curiosity anyone reckon this can be rolled? Link to comment Share on other sites More sharing options...
andyboy Posted February 3, 2009 Share Posted February 3, 2009 Out of curiosity anyone reckon this can be rolled? Should be no problem, if you can cut it you can roll it most of the time. Link to comment Share on other sites More sharing options...
PyroAce Posted August 25, 2012 Share Posted August 25, 2012 I know this is an old thread, I would really like to try these stars, but the formula doesn't add up to 100%? Am I missing something here? Link to comment Share on other sites More sharing options...
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