From Ceramic Arts Daily's 33 Tried and True Glaze Recipes, via Peg of Peg's Pots, I have a recipe for Jim Brown's Blue, which was a pale cobalt-and-rutile confection in Peg's stoneware trials. I have a made two small alterations - replaced 5% of the whiting with talc, and added 1% boron - to avoiding the bubbly, gritty reaction that some glazes get in response to the soda vapor.
Here's my version:
Whiting 23
Talc 5
Custer Spar 60
EPK 12
----------------------------
Cobalt .75%
Rutile 4%
Boron 1%
The surface should be frosty matte.
Good luck with this glaze. I tried it in my wood kiln.....ran like a river! Not a keeper for me. And it wasn't even in a 'hot' spot.
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