As some test tiles just came out of the kiln, it is a perfect opportunity to tell you about it.
First, about the test tiles:
This is my extruder die ( for 2 different extruders):
When I extrude the tiles, I score a line at the bottom of the vertical surface, just above the angle. That makes it easy to break the bottom off for filing:
Once I forgot to do the score line and had to use the angle grinder for this step.
I store the tiles on A4 size 3 mm thick MDF board fitted with stapled elastic on both sides:
I use the same format to write the recipes on the A4 page, and that way I have clear visual reference:
Every now and then a glaze catches my attention that I want to explore fully, so I came up with a series of test that will give me the widest range of colours with the least amount of effort and repetition.
I have mixed 2 kg of glaze base (removing the colourant) and sieved it.
Protect your lungs!!
After dividing the glaze into smaller batches ( see bottom of the chart on the top of the post)
I use precision scales to accurately weigh the colouring oxides. As per chart, I need 1% chromium oxide, which is in this case equivalent to 1g.
This is Triaxial A:
Then the fun begins. I use a syringe to accurately measure 15 ml into second row cups, 10 ml into 3rd row, 5 ml into 4th row and none into 5th.
And they are fired
They start making more sense when I organize them into triaxial blends:
here are a few close ups. I anticipate many hours of playing , sorting and examining....
Red tile is the only one with the stain as colourant (10% signal red). I run out of test tiles and base glaze to test 7.5%, 5% and 2.5%....for now.....
Interesting glaze. I am getting green from cobalt, pale blue from copper and yellow from iron. No chrome - tin pinks though. I like the darker blush at the bottom edge of some tiles.