OctanoicAcid Posted February 3 Share Posted February 3 70 Ammonium perchloriate 15 Hexamine 10 Copper(II) Oxide 5 Magnalium A bright sky blue Link to comment Share on other sites More sharing options...
OctanoicAcid Posted February 3 Author Share Posted February 3 Actually the metal fuels doesn't destroy the blue color. Here is another one without magnalium. Link to comment Share on other sites More sharing options...
MADBOY Posted February 3 Share Posted February 3 Good,,, Use Ap 800 Cu 240 Salac 100 PVC 40 Dark blue Link to comment Share on other sites More sharing options...
Crazy Swede Posted February 3 Share Posted February 3 What is salac? Link to comment Share on other sites More sharing options...
MicroGram Posted February 3 Share Posted February 3 Shellac I'm assuming. Link to comment Share on other sites More sharing options...
OctanoicAcid Posted February 3 Author Share Posted February 3 4 hours ago, MADBOY said: Good,,, Use Ap 800 Cu 240 Salac 100 PVC 40 Dark blue It is copper powder？Not Copper Oxide？ Link to comment Share on other sites More sharing options...
Richtee Posted February 4 Share Posted February 4 Likely the oxide. There is no room for ambiguity in this hobby. Link to comment Share on other sites More sharing options...
OctanoicAcid Posted February 4 Author Share Posted February 4 4 hours ago, OctanoicAcid said: It is copper powder？Not Copper Oxide？ But actually I have been tried several compositions which used PVC.It seems worked not very well.It will turn to a white flame. Link to comment Share on other sites More sharing options...
Zumber Posted February 4 Share Posted February 4 It must be shellac and black cupric oxide. Link to comment Share on other sites More sharing options...
CHNO Posted February 4 Share Posted February 4 (edited) My Calculations: 2 NH4ClO4 + (C6H12N4)/2 (Hexamin) + 0.5 CuO 68% AP / 20% Hex / 12% CuO Oxygen Balance: -21% 2 NH4ClO4 + Hex/3 + (C4H6O)/2 (Shellac) + 0.5 CuO 66% AP / 13% Hex / 10 % Shellac / 11 % CuO OB: -29% Edited February 4 by CHNO Link to comment Share on other sites More sharing options...
Crazy Swede Posted February 4 Share Posted February 4 13 hours ago, MADBOY said: Good,,, Use Ap 800 Cu 240 Salac 100 PVC 40 Dark blue If you really do mean metallic copper powder it is not stable with ammonium perchlorate even with non-aqueous binding. You MUST start using proper English for the ingredients!!! Link to comment Share on other sites More sharing options...
Zumber Posted February 4 Share Posted February 4 6 hours ago, Crazy Swede said: If you really do mean metallic copper powder it is not stable with ammonium perchlorate even with non-aqueous binding. You MUST start using proper English for the ingredients!!! It must not be copper powder as blue stars made with copper powder uses little percentage of copper powder alonghwith other blue colour producing chemicals. It must be black cupric oxide. Link to comment Share on other sites More sharing options...
Arthur Posted February 4 Share Posted February 4 Hexamine is a good choice for blues and it burns with a cool (for a flame!) fire. Many a mix works well when made and tested as soon as dry BUT we all know of a firework that's been through the temperature and humidity cycles of several years and for some formulations this is dangerous. Link to comment Share on other sites More sharing options...
Crazy Swede Posted February 4 Share Posted February 4 Hexamine is normally perfectly stable with ordinary chlorates and perchlorates. What type of formula were you thinking about @Arthur? Link to comment Share on other sites More sharing options...
Crazy Swede Posted February 4 Share Posted February 4 2 hours ago, Zumber said: It must not be copper powder as blue stars made with copper powder uses little percentage of copper powder alonghwith other blue colour producing chemicals. It must be black cupric oxide. There is no such rule. Do you mean that is how it is typically done in India? Link to comment Share on other sites More sharing options...
Zumber Posted February 4 Share Posted February 4 Yeah Here no one use copper powder for blue. 1 Link to comment Share on other sites More sharing options...
MADBOY Posted February 5 Share Posted February 5 On 2/4/2024 at 4:52 AM, OctanoicAcid said: It is copper powder？Not Copper Oxide？ Copper²oxide Link to comment Share on other sites More sharing options...
MADBOY Posted February 5 Share Posted February 5 23 hours ago, Crazy Swede said: If you really do mean metallic copper powder it is not stable with ammonium perchlorate even with non-aqueous binding. You MUST start using proper English for the ingredients!!! Copper ² oxide Link to comment Share on other sites More sharing options...
Crazy Swede Posted February 5 Share Posted February 5 It is written copper(II) oxide or simply cupric oxide. This is the black copper oxide with the chemical formula CuO. The red version, Cu2O (copper(I) oxide), is called cuprous oxide. Your way trying to write the formula for black copper oxide is both incorrect and confusing. I suggest you read up carefully how the pyrotechnic ingredients are spelled in English and how their formulas are written correctly! Link to comment Share on other sites More sharing options...
MADBOY Posted February 5 Share Posted February 5 34 minutes ago, Crazy Swede said: It is written copper(II) oxide or simply cupric oxide. This is the black copper oxide with the chemical formula CuO. The red version, Cu2O (copper(I) oxide), is called cuprous oxide. Your way trying to write the formula for black copper oxide is both incorrect and confusing. I suggest you read up carefully how the pyrotechnic ingredients are spelled in English and how their formulas are written correctly! Yes CuO Link to comment Share on other sites More sharing options...
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