whitefox77 Posted June 24, 2008 Posted June 24, 2008 All of the formulas I've found for green stars either use barium chlorate, or barium nitrate. I haven't been able to find a source for either of these chemicals that will ship then. Does anyone know either a source for these chemicals (preferably the nitrate) or a formula that uses barium sulfate or barium chloride instead?
psyco_1322 Posted June 24, 2008 Posted June 24, 2008 Skylighter archives have an article on barium cabonate greens, they are called radiant greens. Barium Sulfate is usaully for strobes but I have a formula you can try, as im interested in seeing if its any good. Barium Sulfate - 35Potassium Perchlorate - 30Magnalium, 325mesh(200 will probably be ok) - 10Parlon - 20Red Gum - 5
bmarley5780 Posted June 24, 2008 Posted June 24, 2008 Radiant Green Star 40% Potassium perchlorate 30% Barium carbonate 15% Dark pyro aluminum (400 mesh or finer) (any flash or –400 or smaller flake aluminum) 15% Parlon or saran If one wants to rock and roll add an extra 5% dextrin to comp and bind with water and 25% alcohol. ....with added notes from someone...
Bonny Posted June 24, 2008 Posted June 24, 2008 I've never tried this formula from Skylighter's site, but it may be OK, and uses no Barium. GreenPotassium nitrate 15 Sulfur 2 Airfloat charcoal 1 Copper powder 4 Red gum 1 Dextrin 1
mudmanc5 Posted June 25, 2008 Posted June 25, 2008 I just got some from www.jumpinjackflashpyrosupplies.com give them a try
frogy Posted June 25, 2008 Posted June 25, 2008 Hmm... Here's a Shimizu AP Brilliant CompAmmonium perchlorate..............................41Magnesium, 60 mesh................................33.3Red gum...........................................9.5Barium carbonate..................................9.5Potassium bichromate..............................1.9Soluble glutinous rice starch.....................4.8 bi\dichromate are the same if you didn't knowK2Cr2O7... bi and di both mean two(sorry for the teaching if you didn't know, but I am asked this question a lot). I really doubt that you have AP if you don't have BaNO3 though... Granite stars produce a decent Green-ish color... Do you have Zinc dust\powder?
FrKoNaLeaSh1010 Posted June 26, 2008 Posted June 26, 2008 Although granite or Zn spreader stars do make a slight green I have found it very pale and more tealish than straight green. there is deffinitely a huge difference in the quality and brightness of green between barium greens and zinc stars although zinc is a lot easier to obtain and still makes a decent although heavy star.
psyco_1322 Posted June 26, 2008 Posted June 26, 2008 Yah and it usually has to be fresh, very fine zinc dust. Otherwise you get a bad effect.
FrKoNaLeaSh1010 Posted June 26, 2008 Posted June 26, 2008 Well I have only ever used 625mesh Zinc dust as I bought 10lbs for like 25 bucks like 5 years back and still have a bunch left. I should have said that earlier
psyco_1322 Posted June 26, 2008 Posted June 26, 2008 Idk, some say the zinc goes bad and quites working for the effect. I personally had not experienced it.
Mumbles Posted June 26, 2008 Posted June 26, 2008 The bichromate terminology came from mistaken thinking, and not actually the "two" chromates. "Bi" traditionally was applied to poly valent ions with at least 1 hydrogen remaining. Bicarbonate, bisulfate, bisulfite, bitartrate, etc. Well it probably has something to do with "two", but I am not sure on specifics. Dichromate is formed by treating chromate with acid. It changes color. There are 2 potassiums for every 2 chromiums, instead of 2 K : 1Cr. It takes two equivalents of acid to convert 2 chromates into 1 dichromate. If you were doing chemistry back when this was discovered, you'd have thought it was a hydrogen ion getting in there too.
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