dave321 Posted April 13, 2012 Share Posted April 13, 2012 can anyone suggest a deep green bengal comp ? ive tried using the usual materials (barium nitrate , perc, accroide parlon etc)but have not really got a deep green, more of a lime green. i dont have barium chlorate mabe also suggest a deep red bengal more interested in colour than brightness dave Link to comment Share on other sites More sharing options...
mabuse00 Posted April 13, 2012 Share Posted April 13, 2012 (edited) I suggest a formula that was posted here recently: Independence Red Strontium nitrate 50MgAl -200 mesh 18Parlon 16Red gum 10Dextrin 5 That gives a very bright but also very clean red (in my opinion), and burns very slowly. You could also try to use PVC instead of parlon to slow it down further. I would expect it to work as nice with barium nitrate. One might add a few percent to cope with the lower oxygen content. A similar formula I found very nice was Hardt's Green Star 5:Barium nitrate 56Red gum 7MgAl -200 mesh 17PVC 15Dex 5 Both are hard to light with barium nitrate, imho you will need a good two step prime. not really got a deep green, more of a lime greenMaybe you have a purity problem. Edited April 13, 2012 by mabuse00 Link to comment Share on other sites More sharing options...
Potassiumchlorate Posted April 13, 2012 Share Posted April 13, 2012 (edited) For green; this one, but at your own risk, since it's chlorate+sulfur: Barium nitrate 58Potassium chlorate 21Sulfur 21 It's about as deep as barium chlorate+shellac. For red I highly recommend this one from Lancaster: Strontium nitrate 65Potassium chlorate 20Shellac 15 Edited April 13, 2012 by Potassiumchlorate Link to comment Share on other sites More sharing options...
dave321 Posted April 13, 2012 Author Share Posted April 13, 2012 thanks all, i'll try a few of those although i'll stay away from the chlorate sulphur combination,but it sounds like a good deep colour i thought parlon would be better than pvc since it has a higher chlorine content cheers dave Link to comment Share on other sites More sharing options...
dave321 Posted April 14, 2012 Author Share Posted April 14, 2012 I suggest a formula that was posted here recently: Independence Red Strontium nitrate 50MgAl -200 mesh 18Parlon 16Red gum 10Dextrin 5 hi again, now that independence red is nice, i like it very much i will try and sub with barium nitrate, like the hardt composition, and see what the greens like. on a seperate colour, i like the phiko blue composition, beautifull dave Link to comment Share on other sites More sharing options...
50AE Posted April 21, 2012 Share Posted April 21, 2012 For green; this one, but at your own risk, since it's chlorate+sulfur: Barium nitrate 58Potassium chlorate 21Sulfur 21 I tried this long time ago and IIRC, it was shit pale green as hell Link to comment Share on other sites More sharing options...
Potassiumchlorate Posted April 21, 2012 Share Posted April 21, 2012 I tried this long time ago and IIRC, it was shit pale green as hell Pale? How pure was your potassium chlorate? Link to comment Share on other sites More sharing options...
ChloRure Posted April 23, 2012 Share Posted April 23, 2012 I suggest a formula that was posted here recently: Independence Red Strontium nitrate 50MgAl -200 mesh 18Parlon 16Red gum 10Dextrin 5 hi again, now that independence red is nice, i like it very much i will try and sub with barium nitrate, like the hardt composition, and see what the greens like. on a seperate colour, i like the phiko blue composition, beautifull dave I found the comp in another topic and since I dont see any dextrin, I guess that RedGum will act as the binder and I need to use Acetone on those right ? ** Phinko Blue #2 ** Potassium perchlorate 63Black copper oxide 13Parlon 14Red gum 10 Link to comment Share on other sites More sharing options...
Mumbles Posted April 23, 2012 Share Posted April 23, 2012 Acetone or alcohol will work to activate red gum. Alcohol will give you a longer working time with the dampened composition, and is more compatible with nitrile and latex gloves. Acetone will dry faster. If you have a drying chamber, both will be dry pretty quickly. Link to comment Share on other sites More sharing options...
Potassiumchlorate Posted April 23, 2012 Share Posted April 23, 2012 Red gum needs very little alcohol compared with shellac. I think +1-2% by weight will do. For shellac I use +5%. Link to comment Share on other sites More sharing options...
dangerousamateur Posted April 23, 2012 Share Posted April 23, 2012 How will redgum alone work as a binder? Is it strong enough? Link to comment Share on other sites More sharing options...
Potassiumchlorate Posted April 23, 2012 Share Posted April 23, 2012 It's certainly strong enough for a Bengal. The member Karlos here uses 6% red gum for all his stars, by the way. Link to comment Share on other sites More sharing options...
Short5 Posted April 24, 2012 Share Posted April 24, 2012 Acetone or alcohol will work to activate red gum. Alcohol will give you a longer working time with the dampened composition, and is more compatible with nitrile and latex gloves. Acetone will dry faster. If you have a drying chamber, both will be dry pretty quickly.Straight alcohol and no water? Why is the dextrin there, just a fuel in this comp? Link to comment Share on other sites More sharing options...
Mumbles Posted April 24, 2012 Share Posted April 24, 2012 I was responding to ChloRure's question about Phiko blue, which doesn't have dextrin in it as written. There is no reason you couldn't add 4 or 5% in and bind with water though. Link to comment Share on other sites More sharing options...
Short5 Posted April 24, 2012 Share Posted April 24, 2012 (edited) I was responding to ChloRure's question about Phiko blue, which doesn't have dextrin in it as written. There is no reason you couldn't add 4 or 5% in and bind with water though.Okay, sorry to muddle up the thread. To clearify though, in the Independence red formula that calls for both dextrin and red gum, which is the binder? I am guessing one would use alcohol to bind with the red gum rather than adding water to the comp, correct? Edit: I found a good tutorial by Ned from skylighter that explains what I need. http://www.skylighter.com/fireworks/how-to-make/colored-screen-sliced-rubber-stars.asp Edited April 24, 2012 by Short5 Link to comment Share on other sites More sharing options...
Mumbles Posted April 24, 2012 Share Posted April 24, 2012 My general rule is that if it has dextrin, it's designed to be water bound. Besides maybe a few specialized things like tube rolling and sparklers, dextrin isn't good for much else than binding. Link to comment Share on other sites More sharing options...
Potassiumchlorate Posted April 25, 2012 Share Posted April 25, 2012 Mumbles, try barium chlorate and dextrin, 4:1. It's not as good as with shellac or red gum, but it sure beats anything with barium nitrate or carbonate. Link to comment Share on other sites More sharing options...
50AE Posted May 7, 2012 Share Posted May 7, 2012 Potassiumchlorate, my KClO3 was very pure as it is for the other formulas, like for the blues I had. It has always been slowly double recrystallized to huge crystals. Link to comment Share on other sites More sharing options...
Potassiumchlorate Posted May 7, 2012 Share Posted May 7, 2012 Strange. It might be something with the sulfur or barium nitrate too, of course. It was not quite as green as barium chlorate, but it was very green for being a barium nitrate composition without metal fuels. Link to comment Share on other sites More sharing options...
50AE Posted May 7, 2012 Share Posted May 7, 2012 (edited) Strange. It might be something with the sulfur or barium nitrate too, of course. It was not quite as green as barium chlorate, but it was very green for being a barium nitrate composition without metal fuels. Now I can agree with this one Edited May 7, 2012 by 50AE Link to comment Share on other sites More sharing options...
Potassiumchlorate Posted May 7, 2012 Share Posted May 7, 2012 Link to comment Share on other sites More sharing options...
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