Senko Hanabi Sparklers
#1
Posted 30 July 2008 - 05:49 PM
Potassium Nitrate 60
Sulfur 24
Charcoal 16
I made a 1 gram batch of this and no round molten blob formed and if one does it just ends up getting to big and falling off or working a little and then fading away . If anyone has had success in these could you please give your formula and the grams of each component that worked best?
#2
Posted 30 July 2008 - 06:13 PM
KNO3 60%
C 12%
S 28%
But more then likely it's your technique that's giving you problems, are you getting a slow ish black powder that burns with less smoke?
If so, try the above mix and use the following technique,
Ball mill your sulfur and potassium nitrate but NOT the charcoal for 4-6 hours (more then likely your charcoal is too fine by the time it get lit it's burned out); then screen in your charcoal. I pass mine through a meat grinder and then mortar and pestle, I looks very much like air float but in actuality it's coarser and gives much better longer lasting sparks.
Let me know how it goes,
Edited by bigtonyicu, 30 July 2008 - 06:20 PM.
#3
Posted 30 July 2008 - 06:27 PM
#4
Posted 30 July 2008 - 07:32 PM
if the sulfur content is too low, no enough blob forms to hold the rest of the composition together
#5
Posted 31 July 2008 - 08:20 AM
#6
Posted 31 July 2008 - 09:04 AM
Dean
#7
Posted 31 July 2008 - 09:45 AM
In the translations from the Japanese, you often see mention of pine soot - so does this mean pine charcoal, or something more like lampblack, which you could describe as 'soot'?
thegreenman
#8
Posted 31 July 2008 - 12:14 PM
How many grams of your formula have you gotten to work best?
By changing your charcoal to something coarser it makes life much easier, but I tend to make 100g of it at a time.
I was thinking after I posted yesterday, one thing to be careful when making them is how much composition you actually put in them, the trace left on the paper should be very fine. if too much in place on it, the combustion temperature will increase and burn more quickly and might cause the blob to get pushed off by the gasses or simply to fall to the ground under it's own weight.
In the translations from the Japanese, you often see mention of pine soot - so does this mean pine charcoal, or something more like lampblack, which you could describe as 'soot'?
Soot is definitely is lampblack, the main advantage comes from the fact that the ignition temperature for soot is much higher, and instead of burning vigorously it tends to prefer incandescing (making what appears as sparks) in low oxygen environments. But for making senko hanabi it is no "required" charcoal works very well, it just takes some trial and error
#9
Posted 28 January 2010 - 01:33 PM
Here's a timelapse video of my 4th attempt...
I ended up adding a pinch of bicarb to slow the burn somewhat, seemed to do the job. I ended up using small silver rizla papers to roll them which seemed to work rather well...
http://www.flickr.co...mus/4307204815/
I will upload the photos soon...
Now I need to get some decent branching charcoal - this was willow.
#10
Posted 28 January 2010 - 01:44 PM
#11
Posted 28 January 2010 - 11:06 PM
Congratulations on getting senko hanabi to work, though. Do you think we can accomplish colors with the mixture such as red or yellow?
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