Sciencemadness Discussion Board

Make mechas for playing Tejo

Bubbles - 25-3-2023 at 10:44

Me and some friends want to play the Colombian game 'Tejo', which involves throwing a heavy metal disk at little paper packets filled with something, I don't know what, I have read gunpowder, flash powder, flash powder with sand or ground glass.

I have dabbled with fireworks and with amateur chemistry, but not a combination of the two. I have sodium chlorate, sulfur, potassium nitrate and a bunch of stuff more, but not perchlorate, which I heard gives a safer flash powder than chlorate.

Do you have tips for making a friction-sensitive powder that we can safely make and process? We don't want to have to resort to bang snaps ;)

Laboratory of Liptakov - 25-3-2023 at 14:19

When you need something, you could give a link. For clear explanation. Like this one, or another one...

Because clay is wett, you will need hermetic confinement. If you use hermetic confinement against moisture, you can use NaClO3 (which is hygroscopic) + fuel. One from best fuel is in this case potassium ascorbate.
instead KClO3 is possible use NaClO3 in same ratio.

Deathunter88 - 25-3-2023 at 19:02

Per the comments:

They are filled with either white or black powder
-White powder is made of potassium chlorate, ammonium nitrate, sulfur, and powdered sugar.
-black powder is the same as above, except the powdered sugar is replaced with charcoal.

Laboratory of Liptakov - 30-3-2023 at 11:20

Mechas issue resolved here:

BJ68 - 2-4-2023 at 22:00

Thanks for the video....

Here (in German) is a different recipe:
The user was in Bogota and bought mechas for analysis....see pictures in the thread.
In short the powder was a 1:1 mixture of sulfur with potassium chlorate and 3.9% red P and it was damped with water and a tiny amount of dextrin.


Laboratory of Liptakov - 2-4-2023 at 23:25

Great info, BJ68....:cool:
Used formula sounds a like madness...48,3 % KClO3
....S 47,8 % and P 3.9%. + water moisture XY %. However, all compounds are no hygroscopic and they use in wet clay conditions can be advantage. Which decrease or hold sensitivity on acceptable level.

[Edited on 3-4-2023 by Laboratory of Liptakov]

QuieraƱa - 5-10-2023 at 11:52

Laboratory of liptakov on YouTube, links above, are DECENT. it seems vitamin c is a lesser known reductant that, in conjunction with chlorate salts, behaves in a manner not far off from red phosphorus! The red in his mixture is iron oxide, believe it or not. I'm still stunned at the results. Wish I knew this stuff 25 years ago, but hey, at least I still have my fingers! Thank you for sharing the recipe, I was boasting about you and just realized I'm talking to you.

[Edited on 5-10-2023 by QuieraƱa]