Position of Crystals

timhanrahan
New Member

Still growing crystals!

Posts: 22

Position of Crystals Sept 26, 2017 19:33:08 GMT -6

Quote

Post by timhanrahan on Sept 26, 2017 19:33:08 GMT -6

Hi Folks,

Haven't posted for a while, with the "honey-do" list and all... I did get to fire a load last week and was happy with the results, but puzzled by something. Same firing, same shelf, same base glaze - but some of the crystals appear higher on the pieces and larger than others. The tall slender blue piece was in the center of the shelf, the others around the outside. So, is it that the center was slightly cooler that the outside, or is it that some oxides are hotter than others. I would appreciate your thoughts. Tim

photos.google.com/share/AF1QipP85juEerb3X-WDga--O-hF-U2AHODLwYa4x4PNJ9J5cD3Ex8SgQ-FtdvBUFmvroA/photo/AF1QipMfjXuXrEy3dRr3IFxJfvJVZ6S2Hrtlx8qnLn5K?key=eGxOZUt6dktRclhNT0t3SXk4dWpkSE9HdlpYS3Z3

photos.google.com/share/AF1QipP85juEerb3X-WDga--O-hF-U2AHODLwYa4x4PNJ9J5cD3Ex8SgQ-FtdvBUFmvroA/photo/AF1QipMZguY3cJ5alfyKksS_m6WXH5fBq8q-LwuT5mHx?key=eGxOZUt6dktRclhNT0t3SXk4dWpkSE9HdlpYS3Z3

photos.google.com/share/AF1QipP85juEerb3X-WDga--O-hF-U2AHODLwYa4x4PNJ9J5cD3Ex8SgQ-FtdvBUFmvroA/photo/AF1QipOhS73M4kEHwPm_WZPYWQDE5H7D06xQV_75W1OD?key=eGxOZUt6dktRclhNT0t3SXk4dWpkSE9HdlpYS3Z3

photos.google.com/share/AF1QipP85juEerb3X-WDga--O-hF-U2AHODLwYa4x4PNJ9J5cD3Ex8SgQ-FtdvBUFmvroA/photo/AF1QipPWZj2Dkab0OIPOjBTjgm-I0QmWTtyd-zPOHF-m?key=eGxOZUt6dktRclhNT0t3SXk4dWpkSE9HdlpYS3Z3

Not sure if pics will post correctly. I will endeavor to get it right.

Last Edit: Sept 27, 2017 2:31:52 GMT -6 by mohawkpiper: added images

mohawkpiper Administrator Posts: 274	Position of Crystals Sept 27, 2017 2:32:34 GMT -6 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mohawkpiper on Sept 27, 2017 2:32:34 GMT -6 Hey Tim, I added the images... google photos is new to me... I don't know if the links will break in time. Hopefully they don't, but we will find out if they do... G
	animator by day, potter by night

timhanrahan New Member Still growing crystals! Posts: 22	Position of Crystals Sept 27, 2017 20:07:51 GMT -6 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by timhanrahan on Sept 27, 2017 20:07:51 GMT -6 Thanks Greg.

jfox Senior Member Posts: 266	Position of Crystals Sept 27, 2017 20:58:01 GMT -6 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jfox on Sept 27, 2017 20:58:01 GMT -6 Ti nickel ? rutile Nickel ? Nickel Ag? Whats that last one?
	Jim riverpottery.wordpress.com/ www.plus.google.com/+jfoxvideo1/videos/p/pub www.flickr.com/photos/19075646@N07/with/9593781317/ www.youtube.com/user/jfoxvideo1/videos?shelf_id=0&sort=dd&view=0

bill2015
Moderator

Posts: 20

Position of Crystals Sept 28, 2017 10:44:00 GMT -6

Quote

Post by bill2015 on Sept 28, 2017 10:44:00 GMT -6

Tim,
Many variables to consider.
Center of kiln will be ever so slightly cooler than towards the wall, closer to elements.
Loading of the glaze on different sized forms will affect results.
Some metallic oxides will act as additional flux, others are more refractory.
Shape of the pot - shoulder vs no shoulder will affect flow of the glaze - 2nd & 3rd photos, pots more vertical with no shoulder.
Bill

timhanrahan
New Member

Still growing crystals!

Posts: 22

Position of Crystals Oct 1, 2017 10:44:55 GMT -6

Quote

Post by timhanrahan on Oct 1, 2017 10:44:55 GMT -6

Per Jim's question:

Blue is 0.5 CoCa, 4.0 Rut, 1 Ben

Brown is 3.0 BIO, 0.5 Blk CuOx

Green is 3.0 CuCa, 4.0 Rut, 1.0 Ben

Haven't had much Luck with Ni, though I thought my profile pic was 4.0 Ni on my first firing, and I haven't been able to repeat since, though have tried, tried and tried.

Thanks to all respondents. I will have to re-consider these variables when deciding kiln location and which colors for which shape pots.

Thanks, Tim

Tim

jfox Senior Member Posts: 266	Position of Crystals Oct 1, 2017 19:11:38 GMT -6 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jfox on Oct 1, 2017 19:11:38 GMT -6 I get a nice green like #3 with 1% nickel then a coat of 2% Ag in reduction try 1.5% nickel over 3% Fe to get your avatar Blue
	Jim riverpottery.wordpress.com/ www.plus.google.com/+jfoxvideo1/videos/p/pub www.flickr.com/photos/19075646@N07/with/9593781317/ www.youtube.com/user/jfoxvideo1/videos?shelf_id=0&sort=dd&view=0

morgan
New Member

Darn...lot of good info on the old forum. Sad that it got unstable. But whadya do?

Posts: 21

Position of Crystals Oct 2, 2017 7:22:30 GMT -6

Quote

Post by morgan on Oct 2, 2017 7:22:30 GMT -6

I've never used silver nitrate. Google search comes up with powdered and liquid product at various concentrations. Do you use 2% powdered or liquid at what concentration? Not stealing formula's just a starting point to experiment with.

Thanks,
Morgan

Oct 1, 2017 19:11:38 GMT -6 jfox said:

I get a nice green like #3 with 1% nickel

then a coat of 2% Ag in reduction
try 1.5% nickel over 3% Fe to get your avatar Blue

jfox
Senior Member

Posts: 266

Position of Crystals Oct 2, 2017 8:38:20 GMT -6

Quote

Post by jfox on Oct 2, 2017 8:38:20 GMT -6

I make my own. I dissolve silver with nitric acid. it is hazardous but actually quite convenient.with an excess of silver the weight of concentrated acid is approximately equal to the silver nitrate produced gently heated with a little reflux cooling to keep the red nitrogen dioxide gas in the vessel .
when further heating no longer produces the red fumes all the acid is consumed i take out my silver ingot and pour the solution into my glaze.
I no longer dissolve my wife's old silverware as that led to more serious complications . silver nitrate itself is very corrosive in itself and you will inevitably end up with black stained finger or worse without real care

theres more silver containing stuff on my google + page below

Last Edit: Oct 2, 2017 8:42:12 GMT -6 by jfox

Jim
riverpottery.wordpress.com/
www.plus.google.com/+jfoxvideo1/videos/p/pub
www.flickr.com/photos/19075646@N07/with/9593781317/
www.youtube.com/user/jfoxvideo1/videos?shelf_id=0&sort=dd&view=0

Post by timhanrahan on Sept 26, 2017 19:33:08 GMT -6

Post by mohawkpiper on Sept 27, 2017 2:32:34 GMT -6

Post by timhanrahan on Sept 27, 2017 20:07:51 GMT -6

Post by jfox on Sept 27, 2017 20:58:01 GMT -6

Post by bill2015 on Sept 28, 2017 10:44:00 GMT -6

Post by timhanrahan on Oct 1, 2017 10:44:55 GMT -6

Post by jfox on Oct 1, 2017 19:11:38 GMT -6

Post by morgan on Oct 2, 2017 7:22:30 GMT -6

Post by jfox on Oct 2, 2017 8:38:20 GMT -6