Good blue comp with copper carbonate?

[MadMat]

I'm looking for a decent blue star comp that uses copper carbonate. I've tried Conkling blue #2 and the color is a bit pale and not a true blue. Is this the best I am going to get with CuCO3? I am trying this simply because I don't have anything on hand other than CuCO3.

[dynomike1]

Try this

Potassium Perchlorate 61

Copper Carbonate 12

Parlon 13

Red Gum 9

Dextrin 5

That's the one i use.

[MadMat]

Conkling Blue #2 is very close to that:

 

65 Potassium Perchlorate

14 Copper Carbonate

10 Parlon

6 Red Gum

5 Dextrin

 

I do notice that your comp has more parlon... maybe the Conklin's comp is a little deficient in the chlorine donor department. I'll give yours a try, Thanks.

Edited September 24, 2015 by MadMat

[benrenyi4]

Potassium chlorate 52

Copper carbonate 22

Sulphur 15

Chlorinated rubber 7

Dextrin 5

[asdercks]

Potassium Perchlorate 61

Parlon 13

Copper Carbonate or Copper Oxide 12

Red Gum or Phenolic Resin 9

Dextrin 5

Total 100

 

Shimizu #70 really nice blue

Edited October 18, 2015 by asdercks

[ivars21]

You might find this useful: http://pyrodata.com/composition/stars?tid_1[]=292&title=&field_video_video_url=All&description=All&description_1=All

[jessoman]

Royal blue is a nice deep blue, it is like a cartoon blue. Thats how I explain it anyway. Not electric, like a lot of blues. Which can be pale. Goes nicely with dulled down reds. It does use chlorate and you will have to go to the brew shop for some lactose. Worth it.

[Arthur]

I had a nice blue

Perc 60

Black copper oxide 10

Hexamine 10

Parlon 10

red gum 10

 

Very simple but it worked so I never altered it! Go play with it tell me if it's good or you have bettered it.

 

Like lots of comps it depends on the access you have to chemicals and suppliers, and your price point -cheap stars are usually less good competition stars are cost no issue in the chase for perfection.

 

There are good comps with ammonium perchlorate but I don't have a supplier.

[Mia]

That formulae us not shouting at me but if you want AP PM me.

[alvin001]

Mad you can heat the carbonate to make CuO and then make pyroscience blue with +3 fine Al (-325 flake or better black00 or similar dark grade).

[Niladmirari]

(CuOH)2CO3 you need to use in compositions comprising NH4ClO4 or KClO3 to neutralize the acidity. For safety.

 

If you use KClO4 then you do not need (CuOH)2CO3. And you can use CuO.

Edited October 21, 2015 by Niladmirari

[memo]

would copper sulfate have any use in fireworking ?

 

memo

[Niladmirari]

I think during the combustion reaction occurs:

 

(CuOH)2CO3 = CuO + CO2 + H2O,

MgAl + CO2 = MgO + Al2O3 + C

 

Carbon gives the yellow color, which makes the blue color a little bit worse. Therefore CuO best for blue.

 

P.S. Just my 2 cents.

[Mumbles]

It's much more complicated than that Niladmirari. A majority of blues don't have any metallic fuels anyway, or at least only have a small proportion. If carbon is your worry, then you would be better off focusing on your choice of chlorine donor and organic fuels.

 

For what it's worth, copper oxide is basic too.

 

Copper sulfate doesn't have much use in pyro. It's water soluble, which is a problem. It will attack most exposed metals including metallic fuels, tools, screens, etc. It's also acidic and hygroscopic. Some people have tried and succeeded in making some stars and compositions, but they tend to have somewhat limited shelf lives, and don't offer any advantages over more common and stable copper sources.