Hi everyone. Recently I am trying to make crackling microstars. The compositions I have used is ------- Pb3O4--44,Mg-Al (above 100 mesh)--17, CuO --31, KNO3--4, S--4. The lacquer I am using is nitrocellulose base car painting lacquer. The stars burns with golden sparks but with very low noise which is not heard at all from ground when sparking high in the sky. Can anyone give me some light why the sound is so little? Is the proportion incorrect or any mistake I have done making the stars ? Pl, help me.
crackling stars
Started by tamaldas, Sep 24 2010 05:36 PM
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#2
a_bab
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Posted 24 September 2010 - 07:20 PM
"nitrocellulose base car painting lacquer" doesn't sound like "NC laquer". The second is just NC dissolved in acetone, while yours surely has lots of other things dissolved in it (at least plasticizers).
If you can't get real NC laquer your best bet would be pingpong balls. Make sure they are made of celluloid (easy to detect: such a ball should definately smell like mint (camphor actually) when scratched with the finger nail. No smell ---> no celluloid ball)
As about the compo, I'd drop the S/KNO3 all in all. The crack made by a star should be deafening on the soil (like a small cracker)
If you can't get real NC laquer your best bet would be pingpong balls. Make sure they are made of celluloid (easy to detect: such a ball should definately smell like mint (camphor actually) when scratched with the finger nail. No smell ---> no celluloid ball)
As about the compo, I'd drop the S/KNO3 all in all. The crack made by a star should be deafening on the soil (like a small cracker)
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