Two colour donors at the same time?

[Potassiumchlorate]

You sometimes see this. Before Paris Green was used in pyro, you could often see two copper compounds in blue compositions.

 

In the Spanish file with compositions that was posted here recently, you find this composition:

 

Potassium perchlorate 55

Copper(II)oxide 7

Copper powder 7

Red gum 9

Parlon 9

Hexamine 4

MgAl 63µm 4

Dextrin 4

 

and this one:

 

Potassium perchlorate 24

Strontium nitrate 24

Strontium carbonate 11

Red gum 10

Parlon 12

MgAl 63µm 15

Dextrin 4

 

Is it that different compounds give colours that cover somewhat different parts of the colour spectrum?

[psyco_1322]

You ever seen kitchen sink blue? It's a formula John Steinberg threw together with that contains 10 different chemicals, 3 of which are color donors. I've never tried it, too many different things to have to weigh up for a blue.

[Potassiumchlorate]

No, I haven't seen it.

 

I prefer simple formulas, like "Exhibition Green" or New Blue, but I'm willing to try more complicated stuff. For red the best would be something based upon strontium chlorate (deliquescent), strontium perchlorate (deliquescent) or strontium bromate (unobtanium, at least for the time being), so it's the nitrate or carbonate or a combination of them.

Edited December 16, 2012 by Potassiumchlorate

[Arthur]

As ever there are trade-offs to be accepted. For reds Strontium compounds can be good for colour but deliquescent as you say.. What looks good as a star may well not travel well or store well.

[AzoMittle]

You ever seen kitchen sink blue? It's a formula John Steinberg threw together with that contains 10 different chemicals, 3 of which are color donors. I've never tried it, too many different things to have to weigh up for a blue.

 

 

Can someone post this formula please?

[burningRNX]

Sorry didn't look at the age of this topic, but to give a somewhat relevant answer instead of deleting it:

You sometimes see this. Before Paris Green was used in pyro, you could often see two copper compounds in blue compositions.

 

In the Spanish file with compositions that was posted here recently, you find this composition:

For the red possibly to reduce the disadvantage's of both

 

To reduce the amount of carbonate

And to reduce the amount of nitrate,

 

The result would be better than all carbonate in collor and handling it

The hygroscopicy is lower and it burns faster than all nitrate maybey.

 

Using only a low amount of nitrate would dilute the red colour and visa versa with the carbonate.

 

So its a simple trade off. I think.

the blue seems to be a bit tricky to me, I have never used copper powder but it seems to be a somewhat potential fuel/donor combination to me.

It might be that the inventor tried to reduce the amount of CuO, maybey due to cost, i don't know the cost of CuO versus Cu, it could be a reason

Edited November 23, 2014 by burningRNX