Babs, How would you determine that there is Barium in this glaze? Or that it is a glaze at all?
If I were to replicate the surface depicted in the OP, I would use a calcined slip recipe applied by spraying and look towards mason stains for the color. If the color needs a little "bump," chrome.
edit: I missed bciske's post, I guess others did also.
I can't find any images of the work, But Carlos Sanmarco was using this type of surface during his stay at Alfred ~3-4 years ago.
NonScientist, but reader and doer, just by looking, and comparing from memory, looks like a few barium rich dry glazes a number of potters were working with some time ago.
Can get vivid apple green effects with chrome and barium from memory.
I agree, could be what the potter applied to the sculpture prior to glazing, poss. a bit of both.
Certainly many ways to achieve similar effects.
Can't visually say for sure that there is barium there but if this is not a commercial stain, then I'd bet a beer or two or three that barium, lithium and /or strontium are lurking within
I'll try to locate the material I read that related to this.
the pottters that were working with these glazes were not into commercially acquired colours.
EDIT Looking closely at the sculptures in Tyler's link, doubt whether she uses the dry glazes, the colour she obtains looks too flat.