Jump to content
Sign in to follow this  
Babs

Week End Puzzler Any Guesses

Recommended Posts

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.

post-21244-0-35583100-1393633922_thumb.jpg

 

post-21244-0-67892300-1393633946_thumb.jpg

post-21244-0-35583100-1393633922_thumb.jpg

post-21244-0-67892300-1393633946_thumb.jpg

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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. 

Babs likes this

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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 :)

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×