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crackling willow question


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#1 Guest_PyroPDC_*

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Posted 13 June 2015 - 11:05 PM

i am aware how to make dragon eggs for a crackle effects but how are cracking willows made where the stars crackle all the way down to the floor. 

 



#2 Malcolm Smith

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Posted 14 June 2015 - 01:17 AM

A large slow-burning star whose mix contains the egg granules around 25% by weight.

 

It is easier to get the effect consistent with a pumped or a cut star.


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#3 cooperman435

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Posted 14 June 2015 - 01:08 PM

That was my guess too, basically a matrix comet.

MgAl creates a cracke effect but tends to be brighter due to the natural metal colour of white and I doubt as loud as this

#4 Arthur Brown

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Posted 14 June 2015 - 01:56 PM

They are Black willow stars with orange-ish flecks in there. The matrix burns and cooks off the crackle and leaves a "willow" tail of burning charcoal behind


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#5 Arthur Brown

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Posted 16 June 2015 - 10:11 PM

Referencing only the appearance of the stars, they are black with orange flecks showing (and all through). I saw some before they were disposed.


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#6 Aussie Pyro man

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Posted 18 June 2015 - 10:57 PM

Yeah what is the crackle compound again?

#7 cooperman435

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Posted 19 June 2015 - 01:31 AM

In this case is assume lead tetroxide based dragons eggs?

#8 pyrotrev

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Posted 25 June 2015 - 12:37 PM

I have to say that the old red lead compositions seemed to make some of the best "coarse" crackle compositions you could get; almost a mini-salute effect if the grains of crackle comp were big enough - with the bismuth comps I've tried you seem to get multiple smaller cracks.


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#9 RichardH08

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Posted 25 June 2015 - 03:28 PM

I've briefly looked into this issue in the past, reviewing a wide range of published formulae. From what I can see, the bismuth compositions with high to medium content - say 80% to 30% - tend to give multiple crackles. The ones with lower percentages seem to be the ones that are more likely to give a single, loud report.






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