In this method, we are basically Mimiting ourselves to the use of
two materials, In the second method, we use up to four materiéls,
thus giving a much wider range of possibilities, The method is

as follows:-

Take four materials,

A = Any Frit
B = Any Clay
C = Any Flux
D = Flint

These are added together in increasing and decreasing amounts,
in each case making a total of 100. A look at the chart will show
the way it works.

The left-hand side of the square, A-H, accounts for decreasing
amounts of A, with 8 remaining constant, The bottom of the square,
B=-C, accounts for decreasing amounts of B, with C remaining con-
stant. The right-hand side of the square, C-D, accounts for de-
creasing amounts of C, while D remains constant. The top of the
square, D-A, accounts for decreasing amounts of D, while A remains
constant. See

The following page of numbers refers to the crossing points of the
lines, and I hope it is reasonably easy to understand. For example,
let us take Point No. 21. Looking down the line A-B, we find thet
No. 21 is on the line which contains 20 parts of A, Looking across
the line B-C, we find that it falls on the line which contains 30 parts
of B. Looking up the line C=-D, we find that it falls on the Line con-
taining 30 parts C, and locking across the top line, we find it
contains 20 parts of D.

Therefore, Mixture No. 21 contains:

FRIT Z0
CLAY 30
FLUX 30
FLINT 20

Apply mixture to a test tile of whatever clay you normally use. Tile
approximately l=-1/2" x3", At one end, make strokes alternately in
IRON, COPPER, and COBALT over the glaze mix. Fire at cone 04,

This will give you some idea of the effects varlous colourants will make.

ian