In this instructable I will explain the materials, Processes and safety precautions to be taken in the production of Rcandy.
Step 1: Safety precautions
First a few safety tips:
- During the whole process have a fire extinguisher near you and/or a fire blanket,
- Wear full face protection During cooking and ignition because things could get ugly:
- Use an electric Stove and fan forced oven.
If you are under 18 or if is illegal for you to complete this process Do Not continue or Continue at your own risk, I am not liable For ANYTHING
Keep in mind Rcandy is classified as an incendiary.
Step 2: Materials and chemicals
Potassium Nitrate / Saltpeter: Chemical compound KNO3
Stump remover (95%-99%)
Chemical suppliers (Perth= Sigma chemicals or Daly)
Industrial chemical suppliers
Fertilizer stores (>85%)
The LD50 is about 300 grams
Sugar: Chemical Compound Sucrose (C12H22O11)
Icing sugar is best otherwise: White sugar
Fairly universal and harmless so no MSDS is needed
Iron (III) Oxide: Chemical Compound Fe2O3
Oxide colouring "Brick" Red (99%<)
Bunnings or any other good hardware store
Stains like HELL
To buy I suggest about 1Kg of KNO3 at a time the smallest amount of Iron Oxide (for me about 250g) and another kilo of Sugar.
Other materials or tools will be refered to during the instructable.
Step 3: Mixing the ingredients
Mix in a cooking pot:
64g of KNO3
35g of Sucrose (Icing Sugar)
1g Fe2O3 (Powdered)
And add 30-40ml of hot water
Tip: don't make any more than 100g at a time because if there is an accidental ignition the danger is steeply increased!
Tip: If you do decide to make more or less size batches use about the same amount of water as the sugar.
This has a burn rate (for a 5mm thick strand) of 0.41 cm/sec
-As far as I know the mixture is shock and friction insensitive but high temperatures (145C<) will set it off
(DO NOT quote me on that!)
-If you are a lazy bugger you can just burn this as a powder (without the water) but it won't be as impressive.
If you cannot locate iron oxide use this and continue on.
35g Sucrose (Icing Sugar)
40ml Hot Water
This has a burn rate (for a 5mm thick strand) of less than 0.41 cm/sec
Or if you want to try James Yawn's formula mix
15g Sucrose (Icing Sugar)
7ml Karo syrup
30ml Hot water
Without Iron Oxide burn rate (for a 5mm thick strand) 0.211 cm/sec
With Iron Oxide burn rate (for a 5mm thick strand) 0.362 cm/sec
Step 4: Cooking Process
Before the "Crystal Mush" stage Do not use gloves! It may soak up and Ignite, case in point fusepaper...
Once all the solids have dissolved you can turn the heat up a bit.
Tip: if the solution starts bubbling up a lot simply turn down the heat and be patient.
Eventually there will be a red slop and once it starts having the texture more viscous than water this as James Yawn says the "Crystal Mush" stage now turn down the heat to 125 Celsius and put Gloves on.
Once you have passed this stage make sure you mix and stir the propellant a lot because it reduces bubbles of air making it more durable once done.
When it starts looking a bit like putty turn the heat down to 107 Celsius and continue to cook, if you still hear sizzling then there is still water in it.
Once the sizzling has stopped you can take out a small piece the size of a pea and roll it with your fingers.
Tip: Make sure that the Rcandy is covered by something while you are off doing other things so that if it does ignite there will be less damage.
If it feels sticky that's the moisture in it so continue cooking, if its easily roll-able and not sticky mash it flat and let it cool. Once cool bend it and see if it snaps if it bends then keep cooking the rest of it and do another test in a few minutes if it snaps and is brittle then it is ready for moulding and the Rcandy has finished cooking.
-Remember that the propellant is very Hygroscopic so it likes to suck up water from the air, I did a rocket that was supposed to have a burn time of 0.2 seconds and it went for 15 so keep it dry.
Step 5: Flash-Candy
since I have discovered flash candy I have been very worried about its use as a low explosive, and recent test results show that it is has possibly over twice the same power as gunpowder, please do not use in a small or confined space or rapid deflagration will occurr causing explosion!
Flash-candy is a name I gave Rcandy that has been powdered finely and dehydrated which acts similarly to gunpowder and can be molded cold.
Heat oven to 100C - 140C
Place already recrystalised Rcandy into a food processor or Whizzer and give it hell for at least a minute, once its a fine powder have a feel with a spoon.
Unless you're really good at recrystalisation there should be some residual water and it will be squishy and will not flow like dry sand.
So leave to heat in oven for at least 10 minutes and take some out for a try.
Use a fuse! I had the misfortune of finding out what it's capable of so be careful:)
I Suggest electric ignition for anything big 50g< but otherwise use a fuse.
Don't use matches or Lighters
Whatever you have seen on youtube this stuff burns faster with a very hot flame!
I would like to acknowledge James Yawn for not just his inspiration but his process in which this instructable is a hybrid.
I have recently added:
An instructable on the common firework the Roman candle