How To Use Frits, Gerstley And Gillespie Borates For A Satin Finish
Posted 25 November 2010 - 01:10 PM
Next test was spraying Gerstley/Gillespie borate solution using 1 tsp in about 3 cups of water. I fired again at cone 5, which is the lowest standard temperature for glazing at the community college where I fire my pieces. The result was a very dry harsh finish.
My intention is to find a finish that adds a slight flux to the stained and underglazes I use to finish my pieces, something that doesn't look neither too dry or too shiny. I can fire at other temps if I can gather enough work to fill a small kiln. I would appreciate some ideas in how to apply these or other materials to obtain that satiny, smooth finish that I dream of. Thanks and Happy Thanksgiving!
Posted 27 November 2010 - 11:24 AM
A while ago I made some tests with a satin glaze under and on top of stains and commercial underglazes. I liked it best with the color on top of the glaze . The finish was really nice, but some of the underglazes and stains peeled off. I have not tried it using a commercial glaze yet. It's on my list.
I like color and the depth you achieve by layering underglazes and the possibility of multiple firings, having a glaze somewhat limits the process. I read of a Gerstley Borate washes, frit finishes and/or mixing some fluxes to commercial underglazes, but with my tests I have not obtained good results so far. Any other ideas?
Posted 27 November 2010 - 03:14 PM
Reaaly not clear. Can you post a jpg in the gallery?
Posted 11 December 2010 - 05:45 PM
Thanks for your answers.
It took a while, but here are some of my tests.
Mid range red clay fired at cone 5. Left of tile shows 3 coats of Amaco underglazes over studio glaze, and right side shows them under.
Left tile has Paul's White (A), Middle has Satin White (A) and right has French White ©
1)Colors from top to bottom:
LUG 43: Dark Green, bubbled on A & B Left
LUG 21: Medium Blue, bubbled on A left
LUG 26: Turquoise
LUG 22: Dark Blue
LUG 1: Black
2) Colors from top to bottom:
LUG 60: Light yellow, bubbled on A, B & C Left
LUG 65: Orange
LUG 61: Bright Yellow, bubbled on A & B Left
LUG 40: Chartreuse, bubbled on A & B Left
LUG 55: Purple
3) Colors from top to bottom:
V 315: Peach, bubbled on B Left
V 382: Red
V 372: Mint Green: peeled off on A&B left
V 320: Lavender
V 380 Violet
4) Colors from top to bottom:
V303: Terracotta, peeled off on A left
V 382 Red
V 381 Amethyst
V 370 Velour Black , bubbled on A, B & C at left
5) Grey Stoneware, painted with underglazes and sprayed with frit 3124, fired to cone 5
6) Grey Stoneware painted with underglazes and sprayed with Gerstley Borate, fired to cone 5