Post 32 More glaze tests and recipes

This post covers a few additional recipes that produced good satin / matte surfaces, from my recent fourth test series.

The first two sets are derived from John Post's "Pete's Tomato Red" glaze, adapted for our frit substitute. One uses Spodumene and the other not.
If you want to use these reipes where Frit 4108 is not available the original recipe calls for Frit 3134, but you'll need to go back to the source for the balance of the conmponents. I've moved things around a little to try to get the unity formula equivalence in the recipe.

So the first set without Spodumene, unity ratio 6.2.

Nephylene Syenite                  22.6
Whiting                                      7.5
Silica                                         20.7
Frit 4108                                   10.6
Kaolin                                        20.4
Bentonite                                    2
Bone Ash                                   9.8
Mangnesium Carbonate          6.4

4-78 with Copper Carb 0.5%, Cobalt Carb 1.5%, Rutile 6%
4-79 with Copper Carb 2.5%, Rutile 6%
4-80 with RIO 0.5%, Cobalt Carb 0.5%, Nickel Oxide 4%
4-81 with RIO 3.5%, Rutile 6%
4-82 with Titanium Oxide 3%, Tin Oxide 2%, Manganese Carb 3%

 The next set are the ones with the Spodumene substitution, unity ratio also 6.2.
 
Nephylene Syenite                   12
Whiting                                       8
Silica                                         20.5
Frit 4108                                   12.3
Kaolin                                        21.6
Spodumene                              11.2
Bone Ash                                    8
Mangnesium Carbonate          6.4
 

4-83 with Copper Carb 1%, Titanium Oxide 4%, Manganese Carb 4%
4-84 with RIO 4%, Rutile 6%
4-85 with Copper Carb 4%, Rutile 6%
4-86 with Copper Carb 4%, Cobalt Carb 1.5%, Rutile 6%
4-87 with Nickel Oxide 4%, Zinc Oxide 10%

These ones had a little more glossy surface.

The last set are derived from a BTM glaze which I have modified to go satin. Unity ratio 6.6.

Nephylene Syenite                   40
Silica                                         10
Ball Clay                                    15
Talc                                             14
Kaolin                                          6
Wollastonite                              15

4-88 with Copper Carb 0.75%, Cobalt Carb 0.75%, Rutile 6%
4-89 with RIO 1%, Copper Carb 2%, Nickel Oxide 1.5%, Rutile 6%
4-90 with RIO 11%, Zinc Oxide 8% (you can see the zinc crystallisation in the heavier glaze application)
4-91 with RIO 1%, Copper Carb 2%,Nickel Oxide 2%, Tin Oxide 6%

Of these both 4-88 and 4-89 have given a very useful result, a great combination of colour, opacity and surface.

My next challenge is to choose one of these glazes and then use it to do a series which tests a wider colour response. Plans are in hand for about 60 test tiles.