8 replies to this topic

[Malcolm Smith]

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.

[cooperman435]

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

[Arthur Brown]

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

[Arthur Brown]

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

[Aussie Pyro man]

Yeah what is the crackle compound again?

[cooperman435]

In this case is assume lead tetroxide based dragons eggs?

[pyrotrev]

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.

[RichardH08]

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.