J Conway on thu 8 jun 00
Hi all:
I decided to try Laguna Borate and used John Post's Cranberry (PMSP-1) ^6
to try it in. I substituted 1:1 (10.5% GB for 10.5% LB)
1. Slurry was good, seemed a little gritty.
2. Application was good. On a small L-shaped, white clay test tile fired
to bisque at ^06.
3. Fired to small ^6 which gives me a big ^6 at 2:00. In a load that had a
45 min soak.
4. Surface of the fired test is not quite as shiny as the original but is a
very nice satin. However, the colour is much lighter than the original.
Cranberry with GB is a lovely dark, rich colour. The one with Laguna
Borate is also pretty but it is a light dusty rose. The two look great
together.
This is a chrome-tin pink recipe which I think has some specific
requirements to keep the colour from bleaching out. The recipe with the
Laguna borate in it, has 0.026 moles MgO and the original has only
0.003MgO. The calcium is high and B2O3 is low which I believe is good(I'm
a rank novice at this and barely know what I'm doing). I've recalculated
the original recipe with Hyperglaze using Frit 3134 instead of Gerstley
Borate and brought the MgO down to the original amount. So will try making
that up for the next glazing I do.
All-in-all, the base glaze using Laguna Borate looks ok and I'm probably
going to test it with other colouring oxides.
Jackie in the Cariboo where the wild flowers are blooming with great
abundance and hummingbirds are feeding just on the other side of the
window.
J. Conway
150 Mile House, B.C.
V0K 2G0
CANADA
jconway@stardate.bc.ca
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