Thank you all for responding to Bailey Red.
I've noticed several, or maybe most, formulas for iron reds contain Bone Ash.
The suppliers have two forms Di-Calcium, and Tri-Calcium.
The Tri version is three times the price.
The cheaper version is made of ground animal bones.
A search did not turn up any information about which is best.
Seems there was a lot of discussion couple years back even to extent of using human bones.
One woman said she was going to make a glaze with her husbands bones.
Hope she can wait.
Anyone have any preference on which bone to pick?
I tweak the amounts of bone ash in my iron saturates. In a glaze that doesn't have any a little seems to help it lean a little more toward red. I didn't know there were two different kinds. Maybe Min can shed some light on this. Who is that masked man/woman anyway? He/she seems to know a lot about iron saturates.
He/She? I've been called a few names in the past but that's a first : ) No, I don't know a lot about them but I've spent far too much time messing around with glaze tests. The iron red I settled on for use on my clay, M370 Plainsman is Bailey's Red with tricalcium phospate, crocus martis (11.5%) for the iron and soda feldspar not custer. I attached a picture of test tiles with this glaze, hard to capture the sparkles it has without camera glare. Tile on the left is 1 dip, 2 on the right. Breaks darker on edges with 2 dips. It's very smooth, sparkles and survived 3 boiling water/ice water fit tests. My apologies if you already know this but M370 is similar to BMix ^5 with a bit lower expansion.
As an aside, I email Bill Van Gilder about his iron red and concerns about the low silica levels in iron reds, he said that he had talked to a couple glaze tech people and they thought there was nothing to be concerned about since iron is the only thing likely to leach. (I tend to be overly concerned with glaze stability)
Good luck with your glaze testing,
Min (aka he/she : ) - who hates those creepy yellow smiley faces