Babs Posted March 1, 2014 Report Share Posted March 1, 2014 I have a number of jars acquired from various sources, some unlabelled. i am trying to establish what they contain. I did a test tile, ignore lumpy glaze a rush jobbie, the glaze is a C03 Majolica. I had two known and 3 unknown. Nos. 1 nd 3 are cobalt carb and ritle, dark, flour respectively, No. 2 looks like rutile?? but can you help with the guess.... or any further tests I can do. Link to comment Share on other sites More sharing options...
Babs Posted March 1, 2014 Author Report Share Posted March 1, 2014 Too hard, not enough info? No 2 in fact all were mixed part volume equal with gertsley Borate, then water added and applied to the raw Majolica, the colour is a ligh pink/beige WOn't hold anyone responsible for a guess!! Thinking light rutile, htough the pinkish tinge suggests chrome.. but the powder is a darkishbrown any othe test suggestions, don't really want to chuck this out as colourants are getting more expensive. Link to comment Share on other sites More sharing options...
Chilly Posted March 1, 2014 Report Share Posted March 1, 2014 Friday night/Saturday morning. They're all still asleep ! Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted March 1, 2014 Report Share Posted March 1, 2014 Iron! I should be asleep... just finished work Link to comment Share on other sites More sharing options...
Pres Posted March 1, 2014 Report Share Posted March 1, 2014 Yellow Ochre. Link to comment Share on other sites More sharing options...
Chris Campbell Posted March 1, 2014 Report Share Posted March 1, 2014 Oh Babs! You are heading down the slippery slope of getting an absolutely fabulous result with no idea of what got you there. Enjoy !! : - ) Link to comment Share on other sites More sharing options...
Min Posted March 1, 2014 Report Share Posted March 1, 2014 Is there tin in your majolica? Link to comment Share on other sites More sharing options...
Bob Coyle Posted March 1, 2014 Report Share Posted March 1, 2014 I'd go along with Prez and guess Yellow Ocher. Link to comment Share on other sites More sharing options...
Babs Posted March 2, 2014 Author Report Share Posted March 2, 2014 Oh Babs! You are heading down the slippery slope of getting an absolutely fabulous result with no idea of what got you there. Enjoy !! : - ) sounds like my life Ready to pick up and start the next test. I'll keep testing, the powder is nowhere near the colour of yellow ochre. Got some of htat so I'll test it alongside the unknown THe glaze uses tin amd zirc. Powder doesn't resemble chrome oxide but are there othe r oxides of chrome which are a brownish colour. Link to comment Share on other sites More sharing options...
Biglou13 Posted March 2, 2014 Report Share Posted March 2, 2014 I'm with Chris Sorry to be a downer but I'd throw them all away. Lest you fall in love with...then can't repeat. Unless chasing ghosts is you're desire Enjoy your mystery bottles, don't get attached Better would be to ask how do I make these, try and copy them.... Test test test. I'm sure someone here will set you in right direction At least it's repeatable. PPP KEEP CALM GLAZE ON Link to comment Share on other sites More sharing options...
Min Posted March 2, 2014 Report Share Posted March 2, 2014 I'm guessing a low grade of Burnt Umber. The raw colour is dark brown, it contains manganese so that would account for the pink/purple tinge. edit: I would keep the cobalt one, no doubt about that, and toss the rest. Link to comment Share on other sites More sharing options...
C. Banks Posted March 2, 2014 Report Share Posted March 2, 2014 Hey all, I'm with Chris and Biglou. Beautiful mystery glazes are indeed ghosts that will haunt you for years and eat through time and supplies while adding to ever growing limited edition buckets But...maybe just one more line blend... my guess is rutile(tio2) though I have no experience with majolica. I do know that tio2 + zno2 + sno2 will show pink tinges but the effect is dependent on glaze thickness. sorry I don't have more to add other than a shared interest in glaze adventures. *and with Min re. manganese and maybe keeping the cobalt Link to comment Share on other sites More sharing options...
Babs Posted March 3, 2014 Author Report Share Posted March 3, 2014 Hey all, I'm with Chris and Biglou. Beautiful mystery glazes are indeed ghosts that will haunt you for years and eat through time and supplies while adding to ever growing limited edition buckets But...maybe just one more line blend... The potter's grail, just one more test! Already have a beautiful glaze with this mystery powder, used because I thought it was cob.carb as labelled, but know that I'd better mark the pots limited editions! Going to do some more tiles with this powder against knowns. By which time, hey I may not have any left and still searching Link to comment Share on other sites More sharing options...
jrgpots Posted March 4, 2014 Report Share Posted March 4, 2014 How about Erbium oxide (Er2O3) ? It produces a nice pink color at concentrations from 4% - 10%. Jed Link to comment Share on other sites More sharing options...
Babs Posted March 5, 2014 Author Report Share Posted March 5, 2014 How about Erbium oxide (Er2O3) ? It produces a nice pink color at concentrations from 4% - 10%. Jed Yes, I googled as you suggested. L Arbuckle describes it as a pink powder which this is not. Also says it needs 8-10% in a glaze. I'll keep testing and reading till I can/cannot decide but in the mean time I will treat it with caution. Thanks for the lead. Great L Arbuckle handout on colourants. http://lindaarbuckle.com/handouts/colorants-and-opacifiers.pdf Link to comment Share on other sites More sharing options...
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