Hank Murrow on thu 28 mar 02
>Dear Lee Love ,
>
>You are being a busy boy on my behalf. I have filed your recipe
>since Jun glazes are on the agenda when the kiln is rebuilt. I use
>white clay to the exclusion of other colours except where the job
>calls for a dark base.
>
>Are you using True Bone Ash, or a mineral substitute? The thought
>came to me that True Bone Ash, besides containing bone charcoal will
>also have a small percentage of Iron in the ash, derived from
>Haemoglobin. Even if the bone has been rendered before combustion
>the iron will remain in situ. So you have the natural reduction set
>up and the colorant ready made for you. This makes it look as
>thought you may be getting a "Double Blue", optical from the
>Phosphorus and chemical from the iron.
>
>Best regards,
>Ivor.
Dear Ivor & Lee;
I'll bet one could test for iron by doing a fusion button at C/10.
Cheers, Hank
iandol on thu 28 mar 02
Dear Lee Love ,
You are being a busy boy on my behalf. I have filed your recipe since =
Jun glazes are on the agenda when the kiln is rebuilt. I use white clay =
to the exclusion of other colours except where the job calls for a dark =
base.
Are you using True Bone Ash, or a mineral substitute? The thought came =
to me that True Bone Ash, besides containing bone charcoal will also =
have a small percentage of Iron in the ash, derived from Haemoglobin. =
Even if the bone has been rendered before combustion the iron will =
remain in situ. So you have the natural reduction set up and the =
colorant ready made for you. This makes it look as thought you may be =
getting a "Double Blue", optical from the Phosphorus and chemical from =
the iron.
Best regards,
Ivor.=20
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