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Post by chrisb on Nov 15, 2017 9:47:21 GMT -6
How Do you get black crystalline and black crystals?
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joerg
New Member
website: www.crystalsforever.com
Posts: 49
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Post by joerg on Nov 16, 2017 15:19:43 GMT -6
Do some reductions, pray to god and domimate photoshop :-)
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Post by mohawkpiper on Nov 17, 2017 23:20:14 GMT -6
i think the black crystal on black background is a bit different. im not really sure but i heard it was pretty difficult? ive only attempted that one a few times and never put in nearly enough colorants.... but i think its just a LOT of cobalt, iron, and manganese.... in oxidation.
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Post by tileman2 on Nov 18, 2017 6:37:07 GMT -6
3% each of cobalt! red iron! and manganese produces black with blue crystals.
When I tried 3% cobalt! with 4% iron and manganese I got close to black on black using 3110 Frit base. Still not perfect, but as close as I have gotten.
Tom
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Post by mohawkpiper on Nov 18, 2017 10:44:07 GMT -6
yea, the 3-3-3 doesnt give a black crystal. not for me at least. im sure it needs more
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Post by graeme on Nov 18, 2017 19:24:20 GMT -6
Suggestions. Try cobalt oxide instead of carbonate. Try ceramic black body or glaze stains. Cheers. Graeme.
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Post by mikemangion on Nov 19, 2017 1:01:39 GMT -6
Guys the way I managed to achieve a black on black was to overload a bit with copper in Peter Ilsley's Dusty Rose recipe and there was some reduction at the end between 815 oC - 715 oC (1500 oF - 1320 oF) but this was not sufficent enough to turn other copper glazes red, but here is the recipe. Dusty Metallic, Cone 11 (Partial Reduction as described above). 42.0% 4110 24.0% Zinc Oxide 27.0% Silica #350 0.4% Molochite 0.6% Bentonite 2.0% Titanium Dioxide 8.0% Copper Oxide Black 2.0% Manganese Dioxide
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Post by mohawkpiper on Nov 19, 2017 2:53:02 GMT -6
Ha! this is a nice thread! i like it!
I DID use cobalt oxide in mine.... i like the oxide version a lot better in the glaze itself so i use that over carbonate whenever i want anything more than just a hint of cobalt...
The stain could work im sure... but it still needs more stuff. a lot of black stains use chrome... which gives you brown. or if it uses cobalt in the stain you still get a blue crystal. But im sure with more stuff in the glaze you could prolly darken the crystal... I only tried black stains with a clear glaze.
also, the black stains are pretty powerful... a little bit goes a long way. if u put in as much stain as you would when you do the reds, you get this weird bubbling effect like a really pimply face or something.
Thanks for the info mike... will have to give something like that a shot.
I had added copper to a few of my tests... but never one based around reduction.
G
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gczop
Full Member
Posts: 202
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Post by gczop on Nov 19, 2017 11:23:45 GMT -6
Under certain firing, reduction and/or glaze composition conditions one will get what are perhaps black copper or black iron oxides. If you get something like this and reduce it to high heaven(like razing something to the ground) black on black may result. This is high copper oxide in oxidation firing.
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Kuba
Full Member
SztukKilka in Old Formu
Posts: 111
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Post by Kuba on Nov 30, 2017 13:47:41 GMT -6
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paul
Junior Member
Posts: 51
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Post by paul on Dec 12, 2017 17:36:54 GMT -6
Here is a black on black I did a few years ago,12", oxidation, 10% red iron, plus 2 or 3 cobalt, and 2 or 3 manganese I think...... can't remember exactly: Regards Paul
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Post by wesamabd88 on Mar 4, 2019 13:39:58 GMT -6
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