Potters & Sculptors - Making Rock from Mud
Looks like the yellow version of ^6 White Bird'.
neph sy 47
ball clay 10
gerstly borate 23
tin oxide 5
Great on textured darker clay, lovely smooth matte white on white clay, not good on buff colors
For yellow: add 6% rutile. looks very much like your picture on speckled clay. Dependable glaze, doesn't run.
It depends on your base glaze Jeff. 1-3% red iron in the right base, with a little tin (about 2%) will give a light to medium yellow. A little bit of rutile added (1-2%), may lean it toward a more warm, even peachy yellow cast.
In my Cone 6 Ox high alumina matt, at 8% rutile I get a deep, rich, orange. 6% give more of a deep peach, lighter as the rutile is lowered, so I would think 2% might give you a yellow in the right base.