Black copper oxide

[Sparx88]

It's available and makes blue, Is this a good choice for making deep blue? Or as blue as possible?

Edited January 20, 2014 by Sparx88

[Niladmirari]

Deep blue:

 

KClO4 - 39%

CuO - 37%

S - 15%

C2Cl6 - 6,5%

Red Gum - 2,5%

[pyrokid]

I use black copper oxide for a variety of blues and I am satisfied with the depth of the color it gives.

[leedrill]

at this point i prefer CuCO3 for its price and for colour but i have not tried cuo in a comp like royal blue which utilises both kclo3 and kclo4 so my opinion might just be because of the added kclo3 in my blue comp i use and that CuCO3 is quite inert

[Zumber]

CuO contains 79.88% of Cu available and It is used to produce pleasing blue colour in many blue star formulas.

[psyco_1322]

In most formulas you can swap out the copper carbonate for copper oxide, and vice versa with minimal change to the comp.

[Peret]

Paris Green

 

But if you fall out with your wife, be suspicious when she makes you pea soup. You don't have that problem with copper oxide.

[Mumbles]

One of the touted "holy grail" blue formulas had copper carbonate and copper oxide mixed up for a long time. This is what happens when you use the internet as your sole information source instead of real literature. Someone had made an error in transcribing the formula from one of Shimizu's articles or books, and that was passed around for several years. Having used both versions of the formula, I can say they work about equally well. If anything I preferred the copper oxide version better, which was the incorrect one.

 

I like copper oxide better personally. It's denser and less likely to become airborne. Since I generally source it from ceramic suppliers, I also feel that it's cleaner than the carbonate that they sell. Something about stars that aren't dark colors don't look right to me either. Copper carbonate, Paris Green, and especially copper oxychloride tend to give stars that are various shades of blues, greens, and turquoises.