46 replies to this topic

[nordicwolf]

I second this - @Sulphurstan please share your formula!  thanks!

[Sulphurstan]

Ok I'll make some archeological (grin) search in my notes and files from the last 3 years and send that this weekend in this thread.

Edited by Sulphurstan, 04 May 2023 - 02:13 PM.

[nordicwolf]

Hopefully @Sulphurstan can post his formula for his blue.

 

Meanwhile, I found this post on the Skylighter website.  Can anyone suggest what is used for "copper" in the formula? 

  Copper Oxychloride?  Copper Carbonate?  Copper Oxide Black?  Copper Oxide Red?  Something else?   Thank you!

 

 

Blue Fireworks Stars: Attributed to Shimizu

Potassium perchlorate 75.1% Red Gum 11.5% Copper 9.6% Parlon 3.8% SGRS (rice starch) +5%

[Crazy Swede]

@nordicwolf, copper powder is used of course!

[Sulphurstan]

So 4 years ago or so, I was trying to improve the blue compositions I had in the books, with a little research and readings in the litterature.

I want to thank Richard from the UK forum: he was quite a help and gave me a lot of advices and chemical explanations (temperature of flame, gas enveloppe etc...)

 

I built a spectrometer (sadly I bought an el cheapo  camera, and the results are not very accurate ..), and then goofed around with Theremino and Excel to put the recorded burn tests on a CIE color chart.

 

The Na peak you can see on the spectrogram in the attached pdf files is because the Cu Benzo was home made from Na Benzo, and the washing after precipitation was not the best ever made.

With a clean product, without Na, the results shall have been even better.

 

The Hexamine is improving things:  comp 18 is more toward the blue area than comp 11.

Due to poor camera, the absolute position on the CIE chart are probably not right and accurate, but I was happy to see the shift toward the blue area with the Hexamine composition 18.

Burn tests were made 6 times each, with good repeatability in the spectrograms.

 

Compositions:

 

APCUB11

AP                   63

Cu Benzo       23

CuO                4

NC Lacquer   10

Prime: Pinball

 apcub11.mp4   14.59MB   13 downloads

 APCUB11_SPECTR_2_CIE.pdf   163.06KB   8 downloads

 

APCUB18

AP                  63

Cu Benzo      19

CuO               4

Hexamine     10

NC Lacquer   10

(total is 106)

Prime: Pinball

 apcub18.mp4   14.93MB   19 downloads

 APCUB18_SPECTR_2_CIE.pdf   162.72KB   10 downloads

 

 

 

 

Edited by Sulphurstan, 19 May 2023 - 03:26 PM.

[swapnilsutar1988]

So 4 years ago or so, I was trying to improve the blue compositions I had in the books, with a little research and readings in the litterature.
I want to thank Richard from the UK forum: he was quite a help and gave me a lot of advices and chemical explanations (temperature of flame, gas enveloppe etc...)
 
I built a spectrometer (sadly I bought an el cheapo  camera, and the results are not very accurate ..), and then goofed around with Theremino and Excel to put the recorded burn tests on a CIE color chart.
 
The Na peak you can see on the spectrogram in the attached pdf files is because the Cu Benzo was home made from Na Benzo, and the washing after precipitation was not the best ever made.
With a clean product, without Na, the results shall have been even better.
 
The Hexamine is improving things:  comp 18 is more toward the blue area than comp 11.
Due to poor camera, the absolute position on the CIE chart are probably not right and accurate, but I was happy to see the shift toward the blue area with the Hexamine composition 18.
Burn tests were made 6 times each, with good repeatability in the spectrograms.
 
Compositions:
 
APCUB11
AP                   63
Cu Benzo       23
CuO                4
NC Lacquer   10
Prime: Pinball
apcub11.mp4
APCUB11_SPECTR_2_CIE.pdf
 
APCUB18
AP                  63
Cu Benzo      19
CuO               4
Hexamine     10
NC Lacquer   10
(total is 106)
Prime: Pinball
apcub18.mp4
APCUB18_SPECTR_2_CIE.pdf

 
 
 
 

I love second one much.but both are very pretty...!!
Can AP be substited? With what?

[Crazy Swede]

So 4 years ago or so, I was trying to improve the blue compositions...

 

Compositions:

 

APCUB11

AP                   63

Cu Benzo       23

CuO                4

NC Lacquer   10

Prime: Pinball

apcub11.mp4

APCUB11_SPECTR_2_CIE.pdf

 

APCUB18

AP                  63

Cu Benzo      19

CuO               4

Hexamine     10

NC Lacquer   10

(total is 106)

Prime: Pinball

apcub18.mp4

APCUB18_SPECTR_2_CIE.pdf

 

 

 

Sulphurstan,
was the reason of adding copper(II) oxide to the composition to compensate for the poor amount of copper in copper benzoate?

 

That was a problem I had, way back when, when I tried to find the blue star Holy Grail.